137 add xlab option in basic kmplot2

[MikeJSeo]

Just a quick fix.. to allow users to change xlab

[github-actions]

Code Coverage Summary

Filename               Stmts    Miss  Cover    Missing
-------------------  -------  ------  -------  -------------------------------------------------------------------------------------------------------------------
R/binary-helper.R         59       7  88.14%   14, 18, 21, 24, 28, 31, 36
R/bucher.R                62       5  91.94%   103, 107, 111, 186-187
R/maic_anchored.R        348      46  86.78%   90-97, 102-105, 109, 112, 116, 119-122, 125-128, 133, 138, 141, 159-164, 215, 276, 282, 427-436, 445, 451, 522, 539
R/maic_unanchored.R      253      33  86.96%   82-89, 92-93, 98, 101-104, 107-110, 115, 124, 127, 150-157, 186, 243, 250, 359, 366
R/matching.R             251     146  41.83%   68, 73-75, 80-83, 90-93, 104, 131, 152, 188, 227, 269-530
R/plot_km.R              447      46  89.71%   53, 56, 59, 73-103, 294, 297-299, 314-317, 349, 405, 485, 488, 491, 503-504
R/plot_km2.R             107      22  79.44%   50, 59, 62, 65, 87-93, 120-128, 131, 178
R/process_data.R         101      55  45.54%   38-40, 45, 60-63, 69, 81-82, 113-124, 162, 195-260
R/reporting.R             59       0  100.00%
R/survival-helper.R       30       1  96.67%   61
R/time-helper.R           20       3  85.00%   31, 57-58
R/utils.R                 12       9  25.00%   11-20
R/zzz.R                    1       1  0.00%    2
TOTAL                   1750     374  78.63%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 7e24a81

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

  1 files   9 suites   6s ⏱️
 30 tests 29 ✅ 1 💤 0 ❌
100 runs  92 ✅ 8 💤 0 ❌

Results for commit 7e24a81.