[3.0] win32: dirs: do not create some system folders on behalf of the user

These should not be created by VLC

• VLC_HOME_DIR (%userprofile%\Documents)
• VLC_MUSIC_DIR (%userprofile%\Music)
• VLC_PICTURES_DIR (%userprofile%\Pictures)
• VLC_VIDEOS_DIR (%userprofile%\Videos)
• VLC_DESKTOP_DIR = VLC_HOME_DIR (%userprofile%\Documents)
• VLC_TEMPLATES_DIR = VLC_HOME_DIR (%userprofile%\Documents)
• VLC_PUBLICSHARE_DIR = VLC_HOME_DIR (%userprofile%\Documents)
• VLC_DOCUMENTS_DIR = VLC_HOME_DIR (%userprofile%\Documents)
• VLC_DOWNLOAD_DIR = VLC_HOME_DIR (%userprofile%\Documents)

VLC_VIDEOS_DIR/VLC_MUSIC_DIR/VLC_DOWNLOAD_DIR are used by the es_out. But if the system doesn't have them or if they are not usable we should not write in them. The user has the option to set "input-record-path" to set a usable folder.

VLC_PICTURES_DIR is used to save the snapshots and there is "snapshot-path" to use a different folder.

These should be created by VLC if needed:

• VLC_CONFIG_DIR
• VLC_DATA_DIR
• VLC_CACHE_DIR

But they are not actually created during the config_GetAppDir() call.

The creation of the user folder was added in 42e6064e.

Fixes #29488