Make sure server URL always ends with '/'

[bonukai]

No description provided.

[KodeStar]

Might be helpful to add a comment on why this will work better.

[bonukai]

@KodeStar
I do not know much about Vue.js, but from what I can see, server URL is set here:

audiosilo/components/LoginStatus.vue

Lines 50 to 52 in 1f1658a

	set (value) {
	this.$store.commit('app/server', value)
	}

which in turn will call mutation here:

audiosilo/store/app/mutations.js

Lines 56 to 58 in 1f1658a

	export function server (state, data) {
	state.server = data
	}

If we add '/' there, then we can always assume, that state.server ends with '/' and we can join paths with '+' in those places:

audiosilo/plugins/audio.js

Line 70 in 4ea4e04

url = new URL(book.collection + '/', state.server).href

audiosilo/store/app/getters.js

Line 6 in 1f1658a

url = new URL(state.currentCollection + '/', state.server).href

audiosilo/store/app/actions.js

Line 54 in 1f1658a

fetch(data.server + 'authenticate', {

My previous pull request did not realy fix it, it's still not possible to use URL without forward slash at the end, app will try to connect to https://audioserve.zderadicka.euauthenticate/