fix: IAP modal z-index

[FlorianKe]

fixes #105

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.00%. Comparing base (714f5a4) to head (55afa68).

❗ There is a different number of reports uploaded between BASE (714f5a4) and HEAD (55afa68). Click for more details.

HEAD has 23 uploads less than BASE

Flag	BASE (714f5a4)	HEAD (55afa68)
	24	1

Additional details and impacted files

@@              Coverage Diff              @@
##              trunk     #107       +/-   ##
=============================================
- Coverage     78.73%   64.00%   -14.74%     
=============================================
  Files             8       27       +19     
  Lines           348      714      +366     
  Branches          0      126      +126     
=============================================
+ Hits            274      457      +183     
- Misses           74      228      +154     
- Partials          0       29       +29     

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[cyl3x]

@FlorianKe please backport to 6.6