[gnome-mines] Fixed Proprietary license in appdata (fixes #71)

[Robert Roth <robertroth src gnome org>]

commit b6a56107b6b5abc3d705fbcd5b017f361b773db7
Author: Robert Roth <robert roth bee-tf ro>
Date:   Thu Oct 7 08:35:32 2021 +0300

    Fixed Proprietary license in appdata (fixes #71)

 data/org.gnome.Mines.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Mines.appdata.xml.in b/data/org.gnome.Mines.appdata.xml.in
index a675023..e5c3de1 100644
--- a/data/org.gnome.Mines.appdata.xml.in
+++ b/data/org.gnome.Mines.appdata.xml.in
@@ -4,7 +4,7 @@
   <id>org.gnome.Mines</id>
   <metadata_license>CC0-1.0</metadata_license>
 
-  <project_license>GPL-3.0+ and CC-BY-SA-3.0</project_license>
+  <project_license>GPL-3.0+</project_license>
   <name>GNOME Mines</name>
   <summary>Clear hidden mines from a minefield</summary>
   <description>