[meld] Replaced a tab with 4 spaces, as in all the other lines

[Kai Willadsen <kaiw src gnome org>]

commit bd9557394c7497cd8ad06a24e81eaadb6c18c546
Author: Stefan Erichsen <stefan dr4k4n de>
Date:   Wed Nov 14 18:47:30 2018 +0100

    Replaced a tab with 4 spaces, as in all the other lines

 data/meld.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/meld.css b/data/meld.css
index a9b518dd..38baf8ab 100644
--- a/data/meld.css
+++ b/data/meld.css
@@ -1,6 +1,6 @@
 
 .meld-notebook-toolbar {
-       background-image: none;
+    background-image: none;
     background-color: @theme_bg_color;
     border-width: 0 0 1px 0;
     border-style: solid;