Revert "fix: change app_profile_id to the correct header app_profile"

[igorbernstein2]

Reverts #318

The header keys should match the request fields

[tonytanger]

LGTM!

[codecov]

Codecov Report

Merging #335 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #335      +/-   ##
============================================
- Coverage     80.70%   80.69%   -0.02%     
  Complexity     1049     1049              
============================================
  Files            99       99              
  Lines          6541     6541              
  Branches        344      344              
============================================
- Hits           5279     5278       -1     
- Misses         1080     1082       +2     
+ Partials        182      181       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ud/bigtable/data/v2/stub/EnhancedBigtableStub.java	95.74% <100.00%> (ø)	21.00 <0.00> (ø)
...om/google/cloud/bigtable/emulator/v2/Emulator.java	58.26% <0.00%> (-0.87%)	14.00% <0.00%> (ø%)

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