Fix minimize button missing in non-resizable projects.

Fixes https://github.com/godotengine/godot/issues/77603.
On Windows, disabling the 'resizable' flag on the project
settings would also remove the minimize button from the window.

platform/windows/display_server_windows.cpp

@@ -1325,7 +1325,7 @@ void DisplayServerWindows::_get_window_style(bool p_main_window, bool p_fullscre
 				r_style = WS_OVERLAPPEDWINDOW;
 			}
 		} else {
-			r_style = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU;
+			r_style = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
 		}
 	}