[shotwell] Remove warning about obsolete style property

[Jens Georg <jensgeorg src gnome org>]

commit 912cd8b707bf4fbe91c99314bd17fa928da23cf2
Author: Jens Georg <mail jensge org>
Date:   Wed Sep 28 23:32:01 2016 +0200

    Remove warning about obsolete style property
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/Resources.vala |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/src/Resources.vala b/src/Resources.vala
index cceb82b..39f587b 100644
--- a/src/Resources.vala
+++ b/src/Resources.vala
@@ -1089,10 +1089,7 @@ along with Shotwell; if not, write to the Free Software Foundation, Inc.,
     }
 
     public const string CUSTOM_CSS =
-        """LibraryWindow * {
-               -GtkPaned-handle-size: 1;
-            }
-            LibraryWindow .pane-separator {
+         """LibraryWindow .pane-separator {
                background-color: @borders;
             }
             SearchFilterToolbar {