cogl-program: Don't ignore the transpose property of matrix uniforms

When setting a matrix uniform value the transpose property was getting
lost and left uninitialized.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

cogl/cogl-program.c

@@ -241,6 +241,7 @@ cogl_program_uniform_x (CoglHandle handle,
       uniform->value.type = type;
       uniform->value.size = size;
       uniform->value.count = count;
+      uniform->value.transpose = transpose;
       uniform->dirty = TRUE;
     }
 }