[sysprof] theme: add fallback styling for 3.18

[Christian Hergert <chergert src gnome org>]

commit ae5338aaf18888d591a94c642213ec873c79d5d3
Author: Christian Hergert <christian hergert me>
Date:   Fri Apr 15 17:17:44 2016 -0700

    theme: add fallback styling for 3.18
    
    New styling doesn't apply on 3.18 which is used on F23. Since packages are
    being built for that, might as well fix the styling.

 src/resources/theme/shared.css |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/resources/theme/shared.css b/src/resources/theme/shared.css
index 3d4da45..b563d92 100644
--- a/src/resources/theme/shared.css
+++ b/src/resources/theme/shared.css
@@ -1,12 +1,15 @@
+GtkPopover GtkListBox GtkListBoxRow,
 popover list row {
   padding: 6px 10px 6px 10px;
   border-bottom: 1px solid alpha(@borders, 0.2);
 }
 
+GtkPopover GtkListBox GtkListBoxRow:last-child,
 popover list row:last-child {
   border-bottom: none;
 }
 
+GtkPopover SpScrolledWindow,
 popover scrolledwindow {
   border-top: 1px solid alpha(@borders, 0.75);
 }