Fix typos and improve comment clarity in wasm module

[VolodymyrBg]

• Fixed a typo in the StoreAndInstantiateContractProposal.String() method (Coontract → Contract)
• Corrected a spelling mistake in a comment for InstantiateContract2 (predicatable → predictable)
• Improved comment wording in gas_register.go (derserialization → deserialization) for better clarity

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 45.26%. Comparing base (c0e9fec) to head (fdb698a).
Report is 38 commits behind head on main.

Files with missing lines	Patch %	Lines
x/wasm/types/proposal_legacy.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2257   +/-   ##
=======================================
  Coverage   45.26%   45.26%           
=======================================
  Files          79       79           
  Lines       10907    10907           
=======================================
  Hits         4937     4937           
  Misses       5531     5531           
  Partials      439      439           

Files with missing lines	Coverage Δ
x/wasm/keeper/msg_server.go	14.28% <ø> (ø)
x/wasm/types/gas_register.go	97.40% <ø> (ø)
x/wasm/types/proposal_legacy.go	53.56% <0.00%> (ø)

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Thanks!