Remove unnecessary check for zero determinant in Basis::orthonormalize().

core/math/basis.cpp

@@ -77,10 +77,6 @@ void Basis::invert() {
 
 void Basis::orthonormalize() {
 
-#ifdef MATH_CHECKS
-	ERR_FAIL_COND(determinant() == 0);
-#endif
-
 	// Gram-Schmidt Process
 
 	Vector3 x = get_axis(0);