Make sure we pass prefix to enable method

Fixes a call to enable inside Capture.render
  
**Status**: *Ready to Merge*
 
**Reviewers**: @jansepar 
  
## Changes
- pass this.prefix to enable so we properly re-enable resources
  
## How to test-drive this PR
- run test suite `grunt test`
- run Capture.render('<img x-src="someSource" />')  which should change the x-src to src