Patch diff view: More contrast for diff line colors, otherwise hard to read

templates/repo/widget/inline-diff.cassius

@@ -21,8 +21,8 @@ pre
 
 .remove
     background: #{light red}
-    color:      #{dark red}
+    color:      #{black}
 
 .add
     background: #{light green}
-    color:      #{dark green}
+    color:      #{black}