chore: Shorten demo app Activity names (#153)

Author: barbeau

app/src/main/res/values/strings.xml

@@ -17,8 +17,8 @@
 <resources>
   <string name="app_name">android-maps-compose</string>
   <string name="main_activity_title">"Maps Compose Demos \uD83D\uDDFA"</string>
-  <string name="basic_map_activity">Basic Map Activity</string>
-  <string name="map_in_column_activity">Map In Column Activity</string>
+  <string name="basic_map_activity">Basic Map</string>
+  <string name="map_in_column_activity">Map In Column</string>
   <string name="map_clustering_activity">Map Clustering</string>
   <string name="location_tracking_activity">Location Tracking</string>
 </resources>