Remove additional remnants of analytic attribute.

[glassnotes]

Description of the Change: Some parts of the plugin (in particular the GBS device) were still referencing the analytic attribute; have updated these to use the shots attribute instead.

Benefits: Plugin is now up to date.

Possible Drawbacks: None

Related GitHub Issues: None

[codecov]

Codecov Report

Merging #68 (8ffaf33) into master (831131d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          506       506           
=========================================
  Hits           506       506           

Impacted Files	Coverage Δ
pennylane_sf/gbs.py	100.00% <100.00%> (ø)
pennylane_sf/simulator.py	100.00% <100.00%> (ø)

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