Fix argument to EngineProcessor.get_sampler in example notebook

[guygordonZ]

As of #7672 EngineProcessor.get_sampler does not accept the run_name
argument. Use device_config_revision instead.

Fixes b/515775786

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.61%. Comparing base (f4c35b0) to head (c520417).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8091   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
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  Files        1110     1110           
  Lines      100561   100561           
=======================================
  Hits       100175   100175           
  Misses        386      386           

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[pavoljuhas]

Suggested change

	" # device_config_revision=cirq_google.engine.processor_config.Run(run_name)',\n",
	" # device_config_revision=cirq_google.engine.processor_config.Run(run_name),\n",

[pavoljuhas]

LGTM with a cleanup of leftover quote.