improved lastfm

[Tetrax-10]

1. Never declare variables in global scope it creates issues with other extension like Sort by Play Count extension ( I thought my extension is working fine but its working fine because of your global variable. Then I fixed it)
2. If user need to change the username then the placeholder will be the old username
3. diff themes will have diff button color if you don't use any theme it will be green (default) :
   

[Taeko-ar]

Thanks for the fixes :)

[Tetrax-10]

Thanks for the fixes :)

always glad to help, Also I used your popup modal in Sort by Play Count. It lit saved my time thx