minor update to music cog

[realstealthninja]

Minor update:

huge bug fixes and improvements and complying with pep8

Why:

alot of bugs. like reactions not working properly. this was a huge issue as the "interactive controller" became a useless message that just showed the current track

Features:

• using buttons
• fixing another error
• reactions not working + minor bug fixes
• formatted code to look better and increase readability