Fixed ASK dialog for OFF File Plugin

* also removed outcommented code fragment from obj loader
8 jobs for fixOBJAssertion
Status Name Job ID Coverage
  Test
passed clang-c++11-Qt4 #3351
Linux MultiThreads

00:15:46

passed clang-c++11-Qt5 #3355
Linux MultiThreads

00:18:32

passed clang-c++98-Qt4 #3353
Linux MultiThreads

00:05:48

passed clang-c++98-Qt5 #3357
Linux MultiThreads

00:06:58

passed gcc-c++11-Qt4 #3350
Linux

00:03:30

passed gcc-c++11-Qt5 #3354
Linux

00:54:34

passed gcc-c++98-Qt4 #3352
Linux

00:02:48

passed gcc-c++98-Qt5 #3356
Linux

00:03:33