Update gradle.properties

database tests appear to get stuck on ios

Author: nbransby

gradle.properties

@@ -25,7 +25,7 @@ firebase-app.skipIosTests=false
 firebase-auth.skipIosTests=true
 firebase-common.skipIosTests=false
 firebase-config.skipIosTests=false
-firebase-database.skipIosTests=false
+firebase-database.skipIosTests=true
 firebase-firestore.skipIosTests=false
 firebase-functions.skipIosTests=false
 firebase-installations.skipIosTests=false