fix: replace IsEqual with Equal (#14739)

Co-authored-by: Marko <marko@baricevic.me>
Co-authored-by: Marko <marbar3778@yahoo.com>
Closes https://github.com/cosmos/cosmos-sdk/issues/3246

tests/integration/distribution/keeper/delegation_test.go

@@ -805,7 +805,7 @@ func Test100PercentCommissionReward(t *testing.T) {
 	assert.NilError(t, err)
 
 	zeroRewards := sdk.Coins{sdk.NewCoin(sdk.DefaultBondDenom, math.ZeroInt())}
-	assert.Assert(t, rewards.IsEqual(zeroRewards))
+	assert.Assert(t, rewards.Equal(zeroRewards))
 
 	events := ctx.EventManager().Events()
 	lastEvent := events[len(events)-1]