Add mods to beatmap.last_np

[cmyui]

The last_np field is used for keeping context of what the player's last /np'ed.

We currently parse the mods out of the /np in regex:

bancho.py/app/api/domains/cho.py

Lines 74 to 79 in a043f12

	NOW_PLAYING_RGX = re.compile(
	r"^\x01ACTION is (?:playing|editing|watching|listening to) "
	rf"\[https://osu\.(?:{re.escape(BASE_DOMAIN)}|ppy\.sh)/beatmapsets/(?P<sid>\d{{1,10}})#/?(?:osu|taiko|fruits|mania)?/(?P<bid>\d{{1,10}})/? .+\]"
	r"(?: <(?P<mode_vn>Taiko|CatchTheBeat|osu!mania)>)?"
	r"(?P<mods>(?: (?:-|\+|~|\|)\w+(?:~|\|)?)+)?\x01$",
	)

But we do not store this in the beatmap.last_np field after parsing from regex:

1. bancho.py/app/api/domains/cho.py

   Lines 1226 to 1230 in a043f12

   	player.last_np = {
   	"bmap": bmap,
   	"mode_vn": mode_vn,
   	"timeout": time.time() + 300, # /np's last 5mins
   	}

2. bancho.py/app/api/domains/cho.py

   Lines 402 to 406 in a043f12

   	player.last_np = {
   	"bmap": bmap,
   	"mode_vn": mode_vn,
   	"timeout": time.time() + 300, # /np's last 5mins
   	}

This data is useful so it can then later be used for e.g. pp calculation based on context.

[minisbett]

If this is implemented it could directly be integrated into the !with command. Make sure to merge #356 first