Fix Euler order check macro
We need to add one to the last deprecated symbol in order to find the
first non-deprecated enumeration value, instead of adding one after
subtracting the index of the last deprecated symbol.
Spotted by Alexander Larsson.
#define EULER_DEFAULT_ORDER GRAPHENE_EULER_ORDER_SXYZ
-#define LAST_DEPRECATED GRAPHENE_EULER_ORDER_ZYX + 1
+#define LAST_DEPRECATED GRAPHENE_EULER_ORDER_ZYX
-#define ORDER_OFFSET(o) ((o) - LAST_DEPRECATED)
+#define ORDER_OFFSET(o) ((o) - (LAST_DEPRECATED + 1))
/* The orders of rotation we support, minus the deprecated aliases */
enum {
