[gnome-builder] style: work around Adwaita imposing style on top of GtkSourceView

[Christian Hergert <chergert src gnome org>]

commit d245ca513a25991c34a5499317f8dbbcc24a1ddf
Author: Christian Hergert <chergert redhat com>
Date:   Sun Apr 17 10:59:56 2016 -0700

    style: work around Adwaita imposing style on top of GtkSourceView
    
    This really belongs in styleschemes rather than having two places to
    theme GtkTextView.

 data/theme/shared.css |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/data/theme/shared.css b/data/theme/shared.css
index b7f8ea6..ded01ed 100644
--- a/data/theme/shared.css
+++ b/data/theme/shared.css
@@ -199,3 +199,8 @@ perspectiveswitcher button {
   padding: 6px;
 }
 
+
+/* Workaround Adwaita adding borders we don't want */
+textview border.left {
+  background: none;
+}