Prevent updates to decimals for enabled markets

[chenyaoy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 36.36364% with 7 lines in your changes missing coverage. Please review.

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Files with missing lines	Patch %	Lines
x/marketmap/types/errors.go	0.00%	4 Missing ⚠️
x/marketmap/keeper/keeper.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #810   +/-   ##
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  Coverage        ?   57.38%           
=======================================
  Files           ?      214           
  Lines           ?    14836           
  Branches        ?        0           
=======================================
  Hits            ?     8513           
  Misses          ?     5709           
  Partials        ?      614           

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[zrbecker]

We are going to reflect on this change a bit before accepting since in it's current form it would not be optional and if we needed to update decimals for any reason this prevents it completely. Perhaps it should be allow via governance update.