refs #8089 Fixed inconsistent indents in system test (to all spaces)

this was creates problem in running/analyzing it
Removed tab. Refs #8089.
Merge branch 'feature/8089_seq_fit_lebail' of github.com:mantidproject/systemtests into feature/8089_seq_fit_lebail
Merge branch 'feature/8089_seq_fit_lebail' into develop