[MultipleClassFileToPsr4ClassesRector] Original file is deleted and it should not be if it contains class matching filename

[JanMikes]

The original file is being deleted completely, instead of just moving away duplicated classes.

I will investigate further and create failing test, i wonder if tests are passing now :-)

Could be related to #1440 or #1360 ?

[JanMikes]

Failing tests provided

[TomasVotruba]

Probably to #1464