fix a typo in context parameter

[yihuang]

The previous code is not incorrect since the method SetBlockBloom use the ctx passed in rather than the k.ctx.
It's confusing that sometimes methods use ctx in parameter, sometimes use k.ctx, but that's another issue.

Description

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For contributor use:

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• Code follows the module structure standards.
• Wrote unit and integration tests
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• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #329 (395c4e9) into main (0fa75ba) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #329   +/-   ##
=======================================
  Coverage   47.38%   47.38%           
=======================================
  Files          46       46           
  Lines        4611     4611           
=======================================
  Hits         2185     2185           
  Misses       2348     2348           
  Partials       78       78           

Impacted Files	Coverage Δ
x/evm/keeper/abci.go	0.00% <0.00%> (ø)