chore: remove typo (#13914) (#13917)

(cherry picked from commit 34dcca7)

Co-authored-by: Julien Robert <[email protected]>

Author: mergify[bot]

x/group/internal/math/dec.go

@@ -46,10 +46,6 @@ func (x Dec) IsPositive() bool {
 	return !x.dec.Negative && !x.dec.IsZero()
 }
 
-func (x Dec) IsFinite() bool {
-	return x.dec.Form != apd.Finite
-}
-
 // NewDecFromString returns a new Dec from a string
 // It only support finite numbers, not NaN, +Inf, -Inf
 func NewDecFromString(s string) (Dec, error) {