[gnome-software] trivial: Fix make distcheck

[Richard Hughes <rhughes src gnome org>]

commit 254adeda31cf81c5b1cbd4ad7e9a0cf8c328ae0a
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jul 4 10:45:57 2016 +0100

    trivial: Fix make distcheck

 src/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index dae7135..fc34770 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -48,6 +48,7 @@ UI_FILES =                                            \
        gs-app-addon-row.ui                             \
        gs-app-folder-dialog.ui                         \
        gs-app-row.ui                                   \
+       gs-app-tile.ui                                  \
        gs-summary-tile.ui                              \
        gs-auth-dialog.ui                               \
        gs-category-tile.ui                             \