joystick/win32: Fix function return type mismatch

Fixes #14804

(cherry picked from commit 55acc0b82954a50758cf4774365cc1e2877816c6)

src/joystick/windows/SDL_rawinputjoystick_c.h

@@ -25,8 +25,8 @@
 extern bool RAWINPUT_IsEnabled(void);
 
 // Registers for input events
-extern int RAWINPUT_RegisterNotifications(HWND hWnd);
-extern int RAWINPUT_UnregisterNotifications(void);
+extern bool RAWINPUT_RegisterNotifications(HWND hWnd);
+extern bool RAWINPUT_UnregisterNotifications(void);
 
 // Returns 0 if message was handled
 extern LRESULT CALLBACK RAWINPUT_WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);