Add missing includes for SDL_MouseID

Missed in f8844d387c2a0e3ccc7f8ce26001fd745e35bfee and d1eb4adb1618bb2685974eb720b10bc63b049b9f.

include/SDL3/SDL_pen.h

@@ -47,6 +47,7 @@
 
 #include <SDL3/SDL_error.h>
 #include <SDL3/SDL_guid.h>
+#include <SDL3/SDL_mouse.h>
 #include <SDL3/SDL_stdinc.h>
 
 /* Set up for C function definitions, even when using C++ */

include/SDL3/SDL_touch.h

@@ -30,6 +30,7 @@
 
 #include <SDL3/SDL_stdinc.h>
 #include <SDL3/SDL_error.h>
+#include <SDL3/SDL_mouse.h>
 #include <SDL3/SDL_video.h>
 
 #include <SDL3/SDL_begin_code.h>