pointerdetector2: Fix problem drawing the calibration window
pointerdetector2: Fix problem drawing the calibration window

Change-Id: I87791c8d216947f5e1f84750ba0519df5b96f507
shelsonjava/kms-pointerdetector,Kurento/kms-pointerdetector,Kurento/kms-pointerdetector,dfernandezlop/kms-pointerdetector,shelsonjava/kms-pointerdetector,dfernandezlop/kms-pointerdetector,dfernandezlop/kms-pointerdetector,Kurento/kms-pointerdetector,shelsonjava/kms-pointerdetector