Update build.properties

removed alpha tag for release roll

application/build.properties

@@ -1,7 +1,7 @@
 app.name=CommCare
 #app.version MUST be x.y or x.y.z format
 app.version=2.15.0
-commcare.version=v${app.version}alpha
+commcare.version=v${app.version}
 app.vendor=Dimagi,Inc
 app.jarName=${app.name}.jar
 app.description=