WandbLogger save_dir and dir parameters do not work as expected.

[Jigar1201]

Bug description

The save_dir param is set to . by default and hence if save_dir is not None: is always False.
https://github.com/Lightning-AI/pytorch-lightning/blob/d1949766f8cddd424e2fac3a68b275bebe13d3e4/src/lightning/pytorch/loggers/wandb.py#L327C12-L327C20

When a user only specifies the dir and does specify save_dir, the current implementation ignores dir because save_dir is not None (set to . by default). The priority should be 1. Use save_dir if provided, 2. Use dir if save_dir is not present. 3. Use . which is the default.
If this is not a duplicate of an issue and the workflow is expected as described above, let me know and I will be interested in creating a PR to fix this.

What version are you seeing the problem on?

v2.1

How to reproduce the bug

wandb_logger = WandbLogger(
        project="PROJECT", dir=ignored_dir, id=timestr, name=config.run_id, resume=False, job_type="testing", log_model="all")

Error messages and logs

# Error messages and logs here please

Environment

Current environment

#- Lightning Component (e.g. Trainer, LightningModule, LightningApp, LightningWork, LightningFlow):
#- PyTorch Lightning Version (e.g., 1.5.0):
#- Lightning App Version (e.g., 0.5.2):
#- PyTorch Version (e.g., 2.0):
#- Python version (e.g., 3.9):
#- OS (e.g., Linux):
#- CUDA/cuDNN version:
#- GPU models and configuration:
#- How you installed Lightning(`conda`, `pip`, source):
#- Running environment of LightningApp (e.g. local, cloud):

More info

No response