fix: change app_profile_id to the correct header app_profile

[tonytanger]

Fix the header added in #268 to the one being used in experiment.

[codecov]

Codecov Report

Merging #318 into master will increase coverage by 0.33%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #318      +/-   ##
============================================
+ Coverage     80.35%   80.69%   +0.33%     
  Complexity     1049     1049              
============================================
  Files            99       99              
  Lines          6541     6541              
  Branches        343      344       +1     
============================================
+ Hits           5256     5278      +22     
  Misses         1082     1082              
+ Partials        203      181      -22     

Impacted Files	Coverage Δ	Complexity Δ
...ud/bigtable/data/v2/stub/EnhancedBigtableStub.java	95.74% <100.00%> (ø)	21.00 <0.00> (ø)
...able/admin/v2/BaseBigtableInstanceAdminClient.java	61.46% <0.00%> (+4.39%)	56.00% <0.00%> (ø%)
...igtable/admin/v2/BaseBigtableTableAdminClient.java	62.90% <0.00%> (+4.72%)	67.00% <0.00%> (ø%)

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