[INTERNAL] sap.m.P13nDialog - Correct context is now returned from setters
[INTERNAL] sap.m.P13nDialog - Correct context is now returned from setters

 -setShowReset return correct context
- setShowResetEnabled return correct context
- Global qunit test will be added with gerrit change 1647368

Change-Id: I169b4c71121bb86dd0d2d1096fd9e88d1f888701

cschuff/openui5,SAP/openui5,SAP/openui5,SQCLabs/openui5,cschuff/openui5,cschuff/openui5,SQCLabs/openui5,olirogers/openui5,olirogers/openui5,SAP/openui5,nzamani/openui5,olirogers/openui5,SAP/openui5,nzamani/openui5,nzamani/openui5,SQCLabs/openui5