Remove savefig overwrite call to avoid future deprecation error

[bsunnquist]

This PR addresses #904 . It simply removes the overwrite call when saving figures in the readnoise monitor to avoid a future deprecation error. This is the only place I see this argument in our code base.

[pep8speaks]

Hello @bsunnquist, Thank you for submitting the Pull Request !

• In the file jwql/instrument_monitors/common_monitors/readnoise_monitor.py:

Line 47:1: E402 module level import not at top of file
Line 48:1: E402 module level import not at top of file
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Line 56:1: E402 module level import not at top of file
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Line 58:1: E402 module level import not at top of file
Line 59:1: E402 module level import not at top of file
Line 60:1: E402 module level import not at top of file
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Line 62:1: E402 module level import not at top of file
Line 63:1: E402 module level import not at top of file
Line 64:1: E402 module level import not at top of file
Line 357:61: E226 missing whitespace around arithmetic operator
Line 357:110: E226 missing whitespace around arithmetic operator
Line 360:61: E226 missing whitespace around arithmetic operator
Line 360:110: E226 missing whitespace around arithmetic operator
Line 372:33: E226 missing whitespace around arithmetic operator
Line 389:13: E128 continuation line under-indented for visual indent
Line 389:42: E712 comparison to True should be 'if cond is True:' or 'if cond:'
Line 424:13: E722 do not use bare 'except'
Line 460:13: E722 do not use bare 'except'
Line 608:67: E226 missing whitespace around arithmetic operator
Line 608:70: E226 missing whitespace around arithmetic operator
Line 610:66: E226 missing whitespace around arithmetic operator

If you have not done so, please consult the jwql Style Guide

[mfixstsci]

Thanks for submitting this @bsunnquist LGTM