Adwaita: Drop app-specific css

gtk/resources/theme/Adwaita/_apps.scss

@@ -1,9 +0,0 @@
-/*
- * Gedit
- */
-
-.gedit-search-slider {
-  border-radius: 0 0 6px 6px;
-  background-color: $bg_color;
-  padding: 6px;
-}

gtk/resources/theme/Adwaita/gtk-dark.scss

@@ -3,4 +3,3 @@ $variant: 'dark';
 @import 'colors';
 @import 'drawing';
 @import 'common';
-@import 'apps';

gtk/resources/theme/Adwaita/gtk.scss

@@ -12,5 +12,3 @@ $variant: 'light';
 @import 'drawing';
 // actual widget styling
 @import 'common';
-// app overrides. Want this shipped with apps eventually
-@import 'apps';