Fix the minedigger game.
Fix the minedigger game.

Remove the Widgets framework's PointerEventListener definition now that
the Rendering layer has one. It was previously clashing in files that
imported both, which would result in it being hidden. Turns out
MineDigger is the only example that this affects.

mdakin/engine,devoncarew/engine,abarth/sky_engine,mpcomplete/engine,chinmaygarde/sky_engine,mxia/engine,mdakin/engine,tvolkert/engine,flutter/engine,aam/engine,mikejurka/engine,mxia/engine,abarth/sky_engine,jason-simmons/flutter_engine,aam/engine,xunmengfeng/engine,mpcomplete/engine,xunmengfeng/engine,lyceel/engine,devoncarew/sky_engine,devoncarew/engine,Hixie/sky_engine,jason-simmons/flutter_engine,devoncarew/engine,lyceel/engine,mpcomplete/flutter_engine,Hixie/sky_engine,rmacnak-google/engine,mxia/engine,devoncarew/sky_engine,jamesr/sky_engine,xunmengfeng/engine,chinmaygarde/sky_engine,chinmaygarde/flutter_engine,mpcomplete/engine,mikejurka/engine,tvolkert/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,mpcomplete/flutter_engine,krisgiesing/sky_engine,flutter/engine,mpcomplete/flutter_engine,jamesr/flutter_engine,chinmaygarde/sky_engine,flutter/engine,tvolkert/engine,Hixie/sky_engine,jason-simmons/sky_engine,chinmaygarde/flutter_engine,flutter/engine,lyceel/engine,mpcomplete/engine,aam/engine,krisgiesing/sky_engine,jamesr/sky_engine,devoncarew/engine,mdakin/engine,rmacnak-google/engine,tvolkert/engine,mpcomplete/engine,jamesr/sky_engine,mpcomplete/flutter_engine,aam/engine,flutter/engine,cdotstout/sky_engine,rmacnak-google/engine,aam/engine,tvolkert/engine,Hixie/sky_engine,chinmaygarde/sky_engine,mpcomplete/engine,lyceel/engine,rmacnak-google/engine,cdotstout/sky_engine,tvolkert/engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,mxia/engine,lyceel/engine,jason-simmons/sky_engine,mxia/engine,lyceel/engine,mikejurka/engine,devoncarew/engine,mxia/engine,cdotstout/sky_engine,mdakin/engine,rmacnak-google/engine,abarth/sky_engine,xunmengfeng/engine,jamesr/flutter_engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,mdakin/engine,chinmaygarde/sky_engine,abarth/sky_engine,xunmengfeng/engine,devoncarew/sky_engine,jamesr/flutter_engine,cdotstout/sky_engine,flutter/engine,rmacnak-google/engine,mdakin/engine,mdakin/engine,Hixie/sky_engine,devoncarew/sky_engine,chinmaygarde/sky_engine,jamesr/flutter_engine,Hixie/sky_engine,devoncarew/sky_engine,jamesr/flutter_engine,chinmaygarde/flutter_engine,mpcomplete/engine,Hixie/sky_engine,mikejurka/engine,flutter/engine,krisgiesing/sky_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,flutter/engine,aam/engine,jamesr/sky_engine,jamesr/flutter_engine,jason-simmons/flutter_engine,mxia/engine,devoncarew/sky_engine,jason-simmons/sky_engine,xunmengfeng/engine,abarth/sky_engine,lyceel/engine,jamesr/sky_engine,aam/engine,mikejurka/engine,mxia/engine,cdotstout/sky_engine,rmacnak-google/engine,krisgiesing/sky_engine,jason-simmons/sky_engine,krisgiesing/sky_engine,mikejurka/engine,jason-simmons/sky_engine,krisgiesing/sky_engine,jamesr/flutter_engine,jamesr/sky_engine,mikejurka/engine,mpcomplete/flutter_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,tvolkert/engine,cdotstout/sky_engine,devoncarew/engine,jason-simmons/sky_engine,aam/engine,devoncarew/engine,chinmaygarde/sky_engine,xunmengfeng/engine,mikejurka/engine,devoncarew/sky_engine,mpcomplete/flutter_engine,mdakin/engine,mikejurka/engine,jamesr/flutter_engine,abarth/sky_engine,cdotstout/sky_engine,jamesr/sky_engine,abarth/sky_engine,Hixie/sky_engine,krisgiesing/sky_engine,mpcomplete/engine