fix: gas config is set to zero in ibc transfer keeper

[yihuang]

Description

Solution:

• it's better to be safe unless there's good reason for that.

Closes: #969

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Author Checklist

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I have...

• tackled an existing issue or discussed with a team member
• left instructions on how to review the changes
• targeted the main branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.60%. Comparing base (1651ab9) to head (58c276f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #968      +/-   ##
==========================================
- Coverage   65.62%   65.60%   -0.02%     
==========================================
  Files         319      319              
  Lines       22201    22188      -13     
==========================================
- Hits        14569    14557      -12     
  Misses       6483     6483              
+ Partials     1149     1148       -1     

Files with missing lines	Coverage Δ
x/erc20/keeper/ibc_callbacks.go	93.04% <ø> (-0.18%)	⬇️
x/ibc/transfer/keeper/msg_server.go	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[vladjdk]

Agree with this change - there should not be free gas on any action taken on the EVM.