Change round return type to float

(cherry picked from commits c2ffaf5b2b6b2d167c7bcfdcc7b1ad58c8d7c858
and f7cc2b090cf1e32c7671a35839863d0c5d448715)

modules/visual_script/visual_script_builtin_funcs.cpp

@@ -506,10 +506,12 @@ PropertyInfo VisualScriptBuiltinFunc::get_output_value_port_info(int p_idx) cons
 		case MATH_CEIL: {
 			t = Variant::REAL;
 		} break;
-		case MATH_POSMOD:
-		case MATH_ROUND: {
+		case MATH_POSMOD: {
 			t = Variant::INT;
 		} break;
+		case MATH_ROUND: {
+			t = Variant::REAL;
+		} break;
 		case MATH_ABS: {
 			t = Variant::NIL;
 		} break;