Use same name format for backup and map API keys

myTracks/src/main/AndroidManifest.xml

@@ -153,7 +153,7 @@ limitations under the License.
     <!-- For map view v2 -->
     <meta-data
       android:name="com.google.android.maps.v2.API_KEY"
-      android:value="@string/maps_apikey" />
+      android:value="@string/maps_api_key" />
     <!-- Activities -->
     <activity
       android:label="@string/menu_aggregated_statistics"
@@ -291,4 +291,4 @@ limitations under the License.
       android:exported="false"
       android:name="com.google.android.apps.mytracks.content.SearchEngineProvider" />
   </application>
-</manifest>
+</manifest>