LuckPerm: keep contexts active after reload of groups

[garagepoort]

We noticed that AuthMe removes the contexts set by luckperm if we enable the option: enablePermissionCheck
This means that after authentication a user might get a group that should not be active.

For example a user is given group: "Titan" with context "Server=Classic"
The user logs in on server "Other".
Because AuthMe, removes and adds the groups the context is lost.
I created this PR to keep the context after reloading the groups.

[sgdc3]

Looks good to me 👍

[garagepoort]

@sgdc3 @ljacqu
not to sound impatient but will this get merged?

[sgdc3]

@ljacqu @games647 @hex3l can somebody review this too please?

[garagepoort]

hey @sgdc3
My hopes are not too high. But will this get merged?

[sgdc3]

@ljacqu @games647 @hex3l any opinion on this?

[sgdc3]

@garagepoort sorry for the delay, I wanted to wait for a review by the other contributors but they seems to be busy atm 😓