Bugfix vgac reader

[ninahakansson]

Fix a bug I intruded when writing unit test for the time var in the vgac reader. The time_proj0 is a scalar in the files, and now also in the unittest case.

• Tests added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (7e336ee) to head (85d9117).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2754   +/-   ##
=======================================
  Coverage   95.93%   95.94%           
=======================================
  Files         375      375           
  Lines       53223    53293   +70     
=======================================
+ Hits        51058    51130   +72     
+ Misses       2165     2163    -2     

Flag	Coverage Δ
behaviourtests	4.12% <0.00%> (-0.01%)	⬇️
unittests	96.03% <100.00%> (+<0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 8204057910

Details

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.02%

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Totals
Change from base Build 8200761354:	0.0%
Covered Lines:	51002
Relevant Lines:	53116

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💛 - Coveralls

[mraspaud]

LGTM