Adjust and move default priorities

New users will be confused if their macros are not executed,
if they are "blocked" by other scene switching methods.

src/headers/switch-executable.hpp

@@ -10,7 +10,6 @@
 #include "switch-generic.hpp"
 
 constexpr auto exe_func = 3;
-constexpr auto default_priority_3 = exe_func;
 
 struct ExecutableSwitch : SceneSwitcherEntry {
 	static bool pause;