[FIX] set TMPDIR before running plot_peaks

[mattcieslak]

The ODF plotting often requires the --writable-tmpfs flag for apptainer/singularity. This could be due to xvfb trying to use an unwritable temp dir.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 33.94%. Comparing base (df45b9d) to head (87c4174).

Files with missing lines	Patch %	Lines
qsirecon/workflows/recon/dipy.py	0.00%	2 Missing :warning:
qsirecon/cli/recon_plot.py	0.00%	1 Missing :warning:
qsirecon/workflows/recon/amico.py	0.00%	1 Missing :warning:
qsirecon/workflows/recon/mrtrix.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #163 +/- ## ========================================== - Coverage 33.95% 33.94% -0.01% ========================================== Files 57 57 Lines 7192 7193 +1 Branches 983 983 ========================================== Hits 2442 2442 - Misses 4652 4653 +1 Partials 98 98 ```

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