Keyframing: replace mat3_to_quat_is_ok with mat4_to_quat

Added [0] which notes in most cases results are the same but in some
cases the result seems better. While true at the time of writing since
then mat3_to_quat has been improved and used for nearly all matrix
to quaternion conversion.

0: 876cfc837e

source/blender/editors/animation/keyframing.c

@@ -1081,10 +1081,7 @@ static float *visualkey_get_values(
   }
 
   if (strstr(identifier, "rotation_quaternion")) {
-    float mat3[3][3];
-
-    copy_m3_m4(mat3, tmat);
-    mat3_to_quat_is_ok(buffer, mat3);
+    mat4_to_quat(buffer, tmat);
 
     *r_count = 4;
     return buffer;