Add Missing DIK codes to _supportedKeys in XEH_preStart.sqf

[Raven3-14]

Added missing DIK codes to _supportedKeys

When merged this pull request will:

• Add DIK codes "DIK_F16" through to "DIK_F24" to _supportedKeys, allowing them to be displayed as the correct key in CBA keybindings, rather than "Unknown Key ***"

This will make it match the code in perf/prof branch, and should fix the "Unknown Key ***" for F16~F24 when perf/prof is loaded.
I don't think the vanilla fix has been patched to stable. The relevant ticket in the BI feedback tracker has a note "Fixed in 2.20".

[PabstMirror]

just noting that we do need to wait for 2.20 or we get

20:08:48 [CBA] (settings) INFO: Finished reading settings from settings file.
20:08:48 Error in expression <EachPair;
} else {
[_hash, {
_namespace setVariable [_key, _value];
}] call CBA_>
20:08:48   Error position: <setVariable [_key, _value];
}] call CBA_>
20:08:48   Error Reserved variable in expression

on non-profiling w/ filepatching

and because this file is compiled to sqfc the macros won't be defined until we update the includes