[gnome-builder/wip/gtk4-port] plugins/project-tree: remove css overrides

[Christian Hergert <chergert src gnome org>]

commit 6aad194a9e92b9c9c04e0c1a03d1baa3c7499092
Author: Christian Hergert <chergert redhat com>
Date:   Thu Apr 28 20:32:10 2022 -0700

    plugins/project-tree: remove css overrides
    
    These aren't used anymore.

 src/plugins/project-tree/project-tree.gresource.xml | 1 -
 src/plugins/project-tree/themes/shared.css          | 7 -------
 2 files changed, 8 deletions(-)
---
diff --git a/src/plugins/project-tree/project-tree.gresource.xml 
b/src/plugins/project-tree/project-tree.gresource.xml
index 075b14326..b170d433e 100644
--- a/src/plugins/project-tree/project-tree.gresource.xml
+++ b/src/plugins/project-tree/project-tree.gresource.xml
@@ -6,6 +6,5 @@
     <file preprocess="xml-stripblanks">gbp-new-file-popover.ui</file>
     <file preprocess="xml-stripblanks">gbp-rename-file-popover.ui</file>
     <file>project-tree.plugin</file>
-    <file>themes/shared.css</file>
   </gresource>
 </gresources>