Fix to `min_table_width` parameter

[kzwolenik95]

Before the change specifying min_table_width parameter changed the width of the table but the width value seemed random.

After the change width is exactly the parameter value when the content is not wide enough. At the same time this pull request fixes / preserves behavior from #216 (Long title doesn't break table layout)

Added tests for odd and even min_table_width for one, two, three columns tables.

min_table_width=50

+--------------+------------------+--------------+
|      F1      |        F2        |      F3      |
+--------------+------------------+--------------+
|     v 1      |       None       |     v 2      |
+--------------+------------------+--------------+

[codecov[bot]]

Codecov Report

Merging #219 (d039239) into master (aa4e316) will increase coverage by 0.19%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #219      +/-   ##
==========================================
+ Coverage   94.19%   94.38%   +0.19%     
==========================================
  Files           5        5              
  Lines        2258     2281      +23     
==========================================
+ Hits         2127     2153      +26     
+ Misses        131      128       -3     

Flag	Coverage Δ
macos-latest	94.38% <100.00%> (+0.19%)	:arrow_up:
ubuntu-latest	94.38% <100.00%> (+0.19%)	:arrow_up:
windows-latest	94.25% <100.00%> (+0.19%)	:arrow_up:

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Impacted Files	Coverage Δ
src/prettytable/prettytable.py	90.69% <100.00%> (+0.26%)	:arrow_up:
tests/test_prettytable.py	100.00% <100.00%> (ø)

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[etjones]

Nice work, Krzysztof. I rushed that PR without doing as much testing as I should have. I'm grateful to you for cleaning up my mess.

[hugovk]

Thanks!