Small Grover change

[igres26]

Changed the Grover model where the iterative model always outputs something even if it runs for too long of a time.

[codecov]

Codecov Report

Merging #421 (588e25d) into master (3b61c09) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #421   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           79        79           
  Lines        11399     11401    +2     
=========================================
+ Hits         11399     11401    +2     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/qibo/tests/test_parallel.py	100.00% <ø> (ø)
src/qibo/models/grover.py	100.00% <100.00%> (ø)
src/qibo/parallel.py	100.00% <100.00%> (ø)
src/qibo/tests/test_models_grover.py	100.00% <100.00%> (ø)
src/qibo/tests/test_models_variational.py	100.00% <100.00%> (ø)

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[stavros11]

Everything looks good, thanks.