[calls] metainfo: Simplify content rating

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit e46af8fc53c8a6480be22e8486e363c0ea9ead62
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Tue Oct 19 19:17:35 2021 +0200

    metainfo: Simplify content rating
    
    To quote the spec:
    
    In case the <content_rating/> tag is empty (no <content_attribute/> is present),
    it is assumed that the component was checked for age ratings and no age
    restrictions apply.
    
    Source:
    https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-content_rating

 data/org.gnome.Calls.metainfo.xml | 30 +-----------------------------
 1 file changed, 1 insertion(+), 29 deletions(-)
---
diff --git a/data/org.gnome.Calls.metainfo.xml b/data/org.gnome.Calls.metainfo.xml
index 2689c749..309c7535 100644
--- a/data/org.gnome.Calls.metainfo.xml
+++ b/data/org.gnome.Calls.metainfo.xml
@@ -50,35 +50,7 @@
         <dbus type="user">org.gnome.Calls</dbus>
     </provides>
 
-    <content_rating type="oars-1.1">
-        <content_attribute id="violence-cartoon">none</content_attribute>
-        <content_attribute id="violence-fantasy">none</content_attribute>
-        <content_attribute id="violence-realistic">none</content_attribute>
-        <content_attribute id="violence-bloodshed">none</content_attribute>
-        <content_attribute id="violence-sexual">none</content_attribute>
-        <content_attribute id="violence-desecration">none</content_attribute>
-        <content_attribute id="violence-slavery">none</content_attribute>
-        <content_attribute id="violence-worship">none</content_attribute>
-        <content_attribute id="drugs-alcohol">none</content_attribute>
-        <content_attribute id="drugs-narcotics">none</content_attribute>
-        <content_attribute id="drugs-tobacco">none</content_attribute>
-        <content_attribute id="sex-nudity">none</content_attribute>
-        <content_attribute id="sex-themes">none</content_attribute>
-        <content_attribute id="sex-homosexuality">none</content_attribute>
-        <content_attribute id="sex-prostitution">none</content_attribute>
-        <content_attribute id="sex-adultery">none</content_attribute>
-        <content_attribute id="sex-appearance">none</content_attribute>
-        <content_attribute id="language-profanity">none</content_attribute>
-        <content_attribute id="language-humor">none</content_attribute>
-        <content_attribute id="language-discrimination">none</content_attribute>
-        <content_attribute id="social-chat">none</content_attribute>
-        <content_attribute id="social-info">none</content_attribute>
-        <content_attribute id="social-audio">intense</content_attribute>
-        <content_attribute id="social-location">none</content_attribute>
-        <content_attribute id="social-contacts">none</content_attribute>
-        <content_attribute id="money-purchasing">none</content_attribute>
-        <content_attribute id="money-gambling">none</content_attribute>
-    </content_rating>
+    <content_rating type="oars-1.1"/>
 
     <releases>
       <release version="41.0" date="2021-09-18">