Fix bb10 asks for geolocation permissions

- Cordova RTC work item number: 60313
- Apache Cordova Jira issue:
  https://issues.apache.org/jira/browse/CB-5334,
  https://issues.apache.org/jira/browse/CB-5253
- IBM PMR: 41931,057,649
- Worklight RTC work item number: APAR 60273
- Full description: BB10 app with geo plugin would ask for permission to
  use the plugin each tiem it was run. Fixed by using the exec proxy. This
  fix also required backporting CB-5253 removal of webworks.exec