samples: fix HoughLines/HoughLinesP Python sample for 5.0 shape change (fixes#29637) - #29663
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Fixes#29637.
OpenCV 5.0 changed vector-backed Mat/OutputArray to true 1D arrays (see
migration guide: 1D and 0D array semantics). This changes HoughLines/
HoughLinesP Python return shape from (N,1,X) to (N,X), breaking the old
indexing pattern used in the tutorial sample.
Tested locally against opencv-python 5.0 — script runs without error,
lines drawn correctly on samples/data/sudoku.png.
