Remove redundant ts.isArray checks (roblox-ts#1872)

* Update addOneIfArrayType.ts

* Update getAccessorForBindingType.ts

Author: Dionysusnu

src/TSTransformer/util/addOneIfArrayType.ts

@@ -5,7 +5,7 @@ import { isArrayType, isDefinitelyType, isUndefinedType } from "TSTransformer/ut
 import ts from "typescript";
 
 export function addOneIfArrayType(state: TransformState, type: ts.Type, expression: luau.Expression) {
-	if (ts.isArray(type) || isDefinitelyType(type, isArrayType(state), isUndefinedType)) {
+	if (isDefinitelyType(type, isArrayType(state), isUndefinedType)) {
 		return offset(expression, 1);
 	} else {
 		return expression;

src/TSTransformer/util/binding/getAccessorForBindingType.ts

@@ -141,7 +141,7 @@ const iterAccessor: BindingAccessor = (state, parentId, index, idStack, isOmitte
 };
 
 export function getAccessorForBindingType(state: TransformState, node: ts.Node, type: ts.Type): BindingAccessor {
-	if (ts.isArray(type) || isDefinitelyType(type, isArrayType(state))) {
+	if (isDefinitelyType(type, isArrayType(state))) {
 		return arrayAccessor;
 	} else if (isDefinitelyType(type, isStringType)) {
 		return stringAccessor;