Fix removed GetAddOnMetadata function

[chrismeyers]

Summary

Fixes the following errors that prevent the addon from loading:

Message: Interface/AddOns/AutoTurnIn/Defaults.lua:16: attempt to call global 'GetAddOnMetadata' (a nil value)
Time: Tue Aug 13 15:26:32 2024
Count: 1
Stack: Interface/AddOns/AutoTurnIn/Defaults.lua:16: attempt to call global 'GetAddOnMetadata' (a nil value)

Locals: 

Message: ...nterface/AddOns/Blizzard_SharedXMLBase/TableUtil.lua:220: bad argument #1 to 'pairs' (table expected, got nil)
Time: Tue Aug 13 15:26:32 2024
Count: 1
Stack: ...nterface/AddOns/Blizzard_SharedXMLBase/TableUtil.lua:220: bad argument #1 to 'pairs' (table expected, got nil)
[string "@Interface/AddOns/Blizzard_SharedXMLBase/TableUtil.lua"]:220: in function `CopyTable'
[string "@Interface/AddOns/AutoTurnIn/AutoTurnIn.lua"]:26: in main chunk

Locals: settings = nil
shallow = nil
copy = <table> {
}

Resources

It looks like GetAddOnMetadata was deprecated in 10.1.0 and finally removed today in 11.0.2.56110

• https://wowpedia.fandom.com/wiki/API_GetAddOnMetadata
• https://wowpedia.fandom.com/wiki/API_C_AddOns.GetAddOnMetadata
• https://github.com/Gethe/wow-ui-source/blob/10.1.5/Interface/AddOns/Blizzard_Deprecated/Deprecated_10_1_0.lua#L11