Fixed calculation of m02 minor for mat4x4 adjugate

[ainodalok]

A fix for a function that calculates adjugate of a 4x4 matrix in glm\gtx\matrix_operations.inl

template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q > adjugate (mat< 4, 4, T, Q > const &m)

Minor m02 was derived from a 3x3 submatrix which element [1][1] was m[2][2] instead of the m[2][1].

[Groovounet]

I am guessing a unit test would be great...

[Groovounet]

Thanks for contributing