[gnome-builder] plugins/valgrind: fix plugin loading

[Christian Hergert <chergert src gnome org>]

commit c1c6fc02d760b7c03c64b88caa6589a0c2abd779
Author: Christian Hergert <chergert redhat com>
Date:   Mon Apr 25 18:29:52 2022 -0700

    plugins/valgrind: fix plugin loading

 src/plugins/valgrind/valgrind.gresource.xml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/valgrind/valgrind.gresource.xml b/src/plugins/valgrind/valgrind.gresource.xml
index 7fc84b65d..534ca0ffb 100644
--- a/src/plugins/valgrind/valgrind.gresource.xml
+++ b/src/plugins/valgrind/valgrind.gresource.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <gresources>
-  <gresource prefix="/plugins/valgrind_plugin">
+  <gresource prefix="/plugins/valgrind">
+    <file>valgrind.plugin</file>
     <file>gtk/menus.ui</file>
   </gresource>
 </gresources>