[epiphany] Disable NPAPI plugins by default

[Michael Catanzaro <mcatanzaro src gnome org>]

commit fdb5887373b25eaa23223eee1078f9e39dcec651
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri May 25 08:38:17 2018 -0500

    Disable NPAPI plugins by default
    
    https://mail.gnome.org/archives/epiphany-list/2018-March/msg00002.html

 data/org.gnome.epiphany.gschema.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.epiphany.gschema.xml b/data/org.gnome.epiphany.gschema.xml
index ffbf709..3502c1b 100644
--- a/data/org.gnome.epiphany.gschema.xml
+++ b/data/org.gnome.epiphany.gschema.xml
@@ -174,7 +174,7 @@
                        <description>Allow sites to open new windows using JavaScript (if JavaScript is 
enabled).</description>
                </key>
                <key type="b" name="enable-plugins">
-                       <default>true</default>
+                       <default>false</default>
                        <summary>Enable Plugins</summary>
                </key>
                <key type="b" name="enable-webgl">