Increase visible lines of code in IfController and WhileController

[dgetzlaf]

Increase the visible lines of code in IfController and WhileController from 5 to 15 to write more complex statements.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.35%. Comparing base (25ab888) to head (2052f5e).
⚠️ Report is 1186 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #665      +/-   ##
============================================
- Coverage     55.46%   55.35%   -0.12%     
- Complexity    10181    10193      +12     
============================================
  Files          1046     1046              
  Lines         64147    64437     +290     
  Branches       7265     7309      +44     
============================================
+ Hits          35580    35668      +88     
- Misses        26060    26263     +203     
+ Partials       2507     2506       -1     

Files with missing lines	Coverage Δ
...g/apache/jmeter/control/gui/IfControllerPanel.java	68.00% <100.00%> (ø)
.../apache/jmeter/control/gui/WhileControllerGui.java	78.12% <100.00%> (ø)

... and 20 files with indirect coverage changes

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[FSchumacher]

Thanks for the patch.
I have chosen a different path, but I hope, that you still like the result.

[dgetzlaf]

@FSchumacher thank you very much for implementing a nice fix ! :)