change default verbosity to M_STATUS

[kroening]

This changes the default verbosity from M_STATISTICS to M_STATUS, in an effort to reduce the amount of console output.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.19%. Comparing base (da777a0) to head (fddfa12).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8331      +/-   ##
===========================================
- Coverage    78.37%   78.19%   -0.19%     
===========================================
  Files         1726     1726              
  Lines       188325   188767     +442     
  Branches     18445    18498      +53     
===========================================
+ Hits        147607   147608       +1     
- Misses       40718    41159     +441     

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