fix: Use fixed length hex for pointer at FwdCapabilityKey (backport c…

…osmos#11737) (cosmos#12818)

* fix: Use fixed length hex for pointer at FwdCapabilityKey (backport cosmos#11737)

* Update CHANGELOG.md

* add comments and unit tests

CHANGELOG.md

@@ -59,6 +59,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/mint) [#12384](https://github.com/cosmos/cosmos-sdk/pull/12384) Ensure `GoalBonded` must be positive when performing `x/mint` parameter validation.
 * (simapp) [#12437](https://github.com/cosmos/cosmos-sdk/pull/12437) fix the non-determinstic behavior in simulations caused by `GenTx` and check 
 empty coins slice before it is used to create `banktype.MsgSend`.
+* (x/capability) [12818](https://github.com/cosmos/cosmos-sdk/pull/12818) Use fixed length hex for pointer at FwdCapabilityKey.
 
 ## [v0.45.6](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.45.6) - 2022-06-28