[gnome-break-timer] Fix typo :/

[Dylan McCall <dylanmccall src gnome org>]

commit 70a5fe940fb2eff06c720e860302a9c1aa4a194c
Author: Dylan McCall <dylan dylanmccall ca>
Date:   Mon Nov 23 09:09:01 2020 -0800

    Fix typo :/

 src/daemon/activity/MutterActivityMonitorBackend.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/daemon/activity/MutterActivityMonitorBackend.vala 
b/src/daemon/activity/MutterActivityMonitorBackend.vala
index ac169ad..a3e8c74 100644
--- a/src/daemon/activity/MutterActivityMonitorBackend.vala
+++ b/src/daemon/activity/MutterActivityMonitorBackend.vala
@@ -75,7 +75,7 @@ public class MutterActivityMonitorBackend : ActivityMonitorBackend, GLib.Initabl
     }
 
     private void mutter_idle_monitor_disappeared () {
-        GLib.warning ("Mutter idle monitor disappeared")
+        GLib.warning ("Mutter idle monitor disappeared");
         this.mutter_idle_monitor = null;
         this.idle_watch_id = 0;
     }