Fix incorrect string operations on bytes output of 'ps' subprocess #1765
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The subprocess to get the current shell name would always return a bytes output. The subsequent string operations on
that output would always fail with a TypeError.
Using subprocess.run() along with its text flag will fix the issue at hand as well as bring the code in-line with python's.recommendation of using run for all use cases it can handle. The current use case does not warrant a use for subprocess.communicate()
Closes #1754