chore: remove redundant checks

[rootulp]

Closes #664

Note these tests still pass:

celestia-app/x/payment/types/payfordata_test.go

Lines 336 to 342 in 6ad5686

	// MsgPayForData that uses parity shares namespace id
	paritySharesMsg := validMsgPayForData(t)
	paritySharesMsg.MessageNamespaceId = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
	// MsgPayForData that uses tail padding namespace id
	tailPaddingMsg := validMsgPayForData(t)
	tailPaddingMsg.MessageNamespaceId = []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE}

[codecov-commenter]

Codecov Report

Merging #665 (6ad5686) into main (5a31cf0) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #665      +/-   ##
==========================================
+ Coverage   38.45%   38.54%   +0.09%     
==========================================
  Files          19       19              
  Lines        2538     2532       -6     
==========================================
  Hits          976      976              
+ Misses       1476     1472       -4     
+ Partials       86       84       -2     

Impacted Files	Coverage Δ
x/payment/types/payfordata.go	80.76% <100.00%> (+3.56%)	⬆️

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[evan-forbes]

LGMT