Expression: Fix parsing integers as 32-bit

(cherry picked from commit ceba2b67614c8393a8f11f5d8a913a5d13c35836)

core/math/expression.cpp

@@ -1174,7 +1174,7 @@ Error Expression::_get_token(Token &r_token) {
 					if (is_float)
 						r_token.value = num.to_double();
 					else
-						r_token.value = num.to_int();
+						r_token.value = num.to_int64();
 					return OK;
 
 				} else if ((cchar >= 'A' && cchar <= 'Z') || (cchar >= 'a' && cchar <= 'z') || cchar == '_') {