[gnome-shell-sass] style: Fix left tile preview

[Florian Müllner <fmuellner src gnome org>]

commit 32361ac692945e4c2c3ff80d20a4b03649699828
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Nov 1 19:31:15 2017 +0100

    style: Fix left tile preview
    
    Windows that are tiled to the left/right only use rounded corners
    where they are attached to the edge, the preview should follow that.

 _common.scss |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/_common.scss b/_common.scss
index ea36774..9ffb3a7 100644
--- a/_common.scss
+++ b/_common.scss
@@ -714,7 +714,7 @@ StScrollBar {
 }
 
   .tile-preview-left.on-primary {
-    border-radius: $panel-corner-radius $panel-corner-radius 0 0;
+    border-radius: $panel-corner-radius 0 0 0;
   }
 
   .tile-preview-right.on-primary {