Use GLFW_CURSOR_DISABLED (glfw's native mouse restriction)

On Wayland, clients cannot move the mouse pointer.
Mouse constraints, as required for 3D camera movement, are an explicit specific thing,
and glfw supports it with GLFW_CURSOR_DISABLED.
Use DISABLED, unless we're in a menu in windowed mode, where HIDDEN is still appropriate.

src/skel/glfw/glfw.cpp

@@ -1670,6 +1670,8 @@ main(int argc, char *argv[])
 #endif
 		{
 			glfwPollEvents();
+			glfwSetInputMode(PSGLOBAL(window), GLFW_CURSOR,
+			                 (FrontEndMenuManager.m_bMenuActive && !PSGLOBAL(fullScreen)) ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_DISABLED);
 			if( ForegroundApp )
 			{
 				switch ( gGameState )