DietPi-Globals | Renamed G_USER_INPUTS to G_INTERACTIVE

[alpha-tango-kilo]

Status: Ready
Needs checking that it actually works in the real world (specifically the backwards compatibility with scripts), but exporting a value to G_USER_INPUTS is picked up by dietpi-globals and G_INTERACTIVE is then given the value

Reference: #3033 (comment)

Commit list/description:

1. I used skill find to replace all instances of G_USER_INPUTS with G_INTERACTIVE
2. Ignore this commit, aliases don't work in scripts
3. I fixed it, making the variable name change backwards compatible

The point of the PR is basically to make the global variable's name more self-explanatory, while being backwards compatible for the sake of any existing users' scripts

[MichaIng]

@AtkLordOverAll
Many thanks for this, looks good.
I will move the G_USER_INPUTS handling into the G_INTERACTIVE existence check, so the latter has priority and if it exists, a tiny step less is done.

[MichaIng]

Changelog: 03b883c