Pattern twiss fix

[fsoubelet]

Starting with cpymad 1.9.0, Table.selected_rows() now actually returns the indices of the selected elements rather than returning a boolean mask.

The previous behavior had been worked around in get_pattern_twiss.
This PR removes the workaround and adapt to cpymad >= 1.9.0 which is now the minimum required versoin.

[codecov]

Codecov Report

Merging #53 (fd54106) into master (7ecaed4) will increase coverage by 1.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   95.46%   96.57%   +1.10%     
==========================================
  Files          37       36       -1     
  Lines        1698     1605      -93     
==========================================
- Hits         1621     1550      -71     
+ Misses         77       55      -22     

Impacted Files	Coverage Δ
pyhdtoolkit/__init__.py	100.00% <100.00%> (ø)
pyhdtoolkit/cpymadtools/twiss.py	100.00% <100.00%> (ø)
pyhdtoolkit/utils/htc_monitor.py

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