[gnome-builder] themes: drop content_view_bg styling for search button

[Christian Hergert <chergert src gnome org>]

commit 1490439094a0ba5f1053ca65a6d2b6ce4c095930
Author: Christian Hergert <chergert redhat com>
Date:   Sat Dec 14 13:17:03 2019 -0800

    themes: drop content_view_bg styling for search button
    
    This looked too wrong on a number of non-Adwaita themes. As
    much as I prefer the "this is an editable" styling, I'm
    tired of seeing poorly implemented themes look so completely
    broken.
    
    Fixes #915

 src/libide/themes/themes/shared.css | 7 -------
 1 file changed, 7 deletions(-)
---
diff --git a/src/libide/themes/themes/shared.css b/src/libide/themes/themes/shared.css
index c28b2d76d..e14da6f0b 100644
--- a/src/libide/themes/themes/shared.css
+++ b/src/libide/themes/themes/shared.css
@@ -143,13 +143,6 @@ dzlstacklist .stack-header {
   opacity: 0.55;
 }
 
-
-/* Make suggestion (search) button look like an entry */
-.suggestionbutton button {
-  background-color: @content_view_bg;
-  background-image: none;
-}
-
 row:selected label.keycap {
   color: @theme_fg_color;
 }