Use abspaths for the ODF plotter

[mattcieslak]

Closes #118
@araikes noticed that the ODF plotter might be attempting to write out the pngs into the user's home directory. This PR forces the plotter to store images in the runtime working directory

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 8.00000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 47.64%. Comparing base (e99614e) to head (4ffc278).

Files with missing lines	Patch %	Lines
qsirecon/cli/recon_plot.py	0.00%	12 Missing ⚠️
qsirecon/interfaces/reports.py	15.38%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
- Coverage   47.73%   47.64%   -0.10%     
==========================================
  Files          57       57              
  Lines        7213     7231      +18     
  Branches      984      986       +2     
==========================================
+ Hits         3443     3445       +2     
- Misses       3565     3581      +16     
  Partials      205      205              

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[tsalo]

It sounds like @araikes tested this out and it works.

[tsalo]

Should this close #118?

[mattcieslak]

Should this close #118?

I think so