@perun decorator returns the last execution result

[JuanPedroGHM]

Fixes: #146

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 64.18%. Comparing base (17067e1) to head (5ec0811).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
perun/monitoring/monitor.py	66.66%	3 Missing ⚠️
perun/core.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   62.60%   64.18%   +1.58%     
==========================================
  Files          31       31              
  Lines        2444     2446       +2     
==========================================
+ Hits         1530     1570      +40     
+ Misses        914      876      -38     

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