Folder names inconsistent if version is string and using TensorBoardLogger

[hjalmarlucius]

A) According to TensorBoardLogger, if version is a string then it is used as the run-specific subdirectory name, otherwise 'version_${version}' is used.
B) However, in the callback 'version_${version}' is always used.

LINKS:
A) https://github.com/PyTorchLightning/pytorch-lightning/blob/8b82ce09039e75f3fcb77a987c964249e38def3b/pytorch_lightning/loggers/tensorboard.py#L40
B) https://github.com/PyTorchLightning/pytorch-lightning/blob/3e8f2d99a9951bfb5fc67a98614128317913be1d/pytorch_lightning/trainer/callback_config.py#L55

Edit: This issue comes up as I generally use git commit IDs as version numbers.

[CarloLucibello]

this has been recently fixed in #1748

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