Remove flags from getPrimaryKey() and getOldPrimaryKey() methods

[Tigrov]

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	✔️
Fixed issues	#285

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.13%. Comparing base (05c8a56) to head (c9df1e7).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #422      +/-   ##
============================================
+ Coverage     88.62%   89.13%   +0.50%     
+ Complexity      560      559       -1     
============================================
  Files            17       17              
  Lines          1328     1353      +25     
============================================
+ Hits           1177     1206      +29     
+ Misses          151      147       -4     

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