[nautilus] style: Fix free disk space caption dot color

[António Fernandes <antoniof src gnome org>]

commit ba1f41b59268f980d639a3d15256a223bf918c37
Author: António Fernandes <antoniof gnome org>
Date:   Sun Sep 4 17:05:08 2022 +0100

    style: Fix free disk space caption dot color
    
    It hardcodes a color which matches only in light mode, and only if high
    contrast is not enabled.
    
    Instead derive from currentColor to get light/dark automatic support
    and double the alpha opacity on high contrast.
    
    The alpha values were copied from libadwaita's color used by level bar.

 src/resources/style-hc.css | 4 ++++
 src/resources/style.css    | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/resources/style-hc.css b/src/resources/style-hc.css
index 1f6327824..54e2cff89 100644
--- a/src/resources/style-hc.css
+++ b/src/resources/style-hc.css
@@ -10,3 +10,7 @@
 #NautilusQueryEditorTag {
   box-shadow: inset 0 0 0 1px @borders;
 }
+
+.disk-space-free {
+  color: alpha(currentColor, 0.3);
+}
diff --git a/src/resources/style.css b/src/resources/style.css
index 205811c53..54cf22953 100644
--- a/src/resources/style.css
+++ b/src/resources/style.css
@@ -118,7 +118,7 @@
 }
 
 .disk-space-free {
-  color: alpha(@dark_5, 0.12);
+  color: alpha(currentColor, 0.15);
 }
 .disk-space-used {
   color: @accent_bg_color;