AzuraCast fixes

[Sella-GH]

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src/AzzyBot.Bot/Services/Modules/AzuraCastPingService.cs:22

• [nitpick] The error message string could be clearer. Consider rephrasing to 'The certificate for AzuraCast instance URI is self-signed and therefore not valid! Please install a valid HTTPS certificate for your AzuraCast instance so AzzyBot can safely connect to it.'

private const string ValidCertNeeded = "The certificate for AzuraCast instance **URI** is self-signed and therefore not valid!\nYou need a valid HTTPS certificate for your AzuraCast instance so AzzyBot can safely connect to it.";

src/AzzyBot.Bot/Commands/ConfigCommands.cs:113

• The error message 'Apparently you have an AzuraCast instance configured, but it's not online.' was removed. This might lead to confusion if the instance is not online, and the user doesn't get any feedback.

await context.DeleteResponseAsync();

src/AzzyBot.Bot/Commands/ConfigCommands.cs:591

• [nitpick] The variable name 'ac' is ambiguous. It should be renamed to 'azuraCastInstance'.

AzuraCastEntity ac = guild.AzuraCast;