[gimp] themes: fix textview background color.

[Jehan <jehanp src gnome org>]

commit 9aa32ffe423085f4194501f0436e2fca5c8e27e6
Author: Jehan <jehan girinstud io>
Date:   Fri Sep 30 00:34:20 2022 +0200

    themes: fix textview background color.
    
    It seems I had forgotten some hardcoded color in there. I didn't notice it until
    now, because it was not that bad in the few instances where it was shown (for
    instance the comment field in export plug-ins), but I really realized there was
    a problem with the Python console which was not too practical (white writing on
    kinda light background).

 themes/Default/common.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/themes/Default/common.css b/themes/Default/common.css
index dc56a16672..903c538609 100644
--- a/themes/Default/common.css
+++ b/themes/Default/common.css
@@ -70,7 +70,7 @@ GimpDisplayShell, GimpDock, .dialog-action-box, .dialog-vbox {
 
 /* GtkTextView */
 textview text, textview {
-  background-color: rgba (184, 184, 184, 0.5);
+  background-color: @extreme-bg-color;
   color: @fg-color;
 }
 /* End GtkTextView */