feat [conditions] use lower case for new attribute disablesourceinput

[dduportal]

As per #321 (comment), this PR does damage control on the naming convention by setting the attribute to lower case.

The doc. PR at updatecli/website#154 had been updated

[lemeurherve]

Maybe I'm missing something but no camelCase, no snake_case, no PascalCase, only lower case for all variables names from now on?
What about the existing variables names? Should they keep their (mixed) cases or should they all be converted to lower case?

[dduportal]

@lemeurherve sorry, i wrote the PR message too quickly: it's only about the freshly added attribute, and keeping it in lowercase to map to "most" of the other attributes.

The goal is NOT to define/apply a convention on the rest: it's just that I felt it was not necessary to introduce a new attrribute that would be different than the others (that are already not homogeneous 😅)

[lemeurherve]

@dduportal make sense :)

Let's add a 1337c453 to the mix for the next one then!

[dduportal]

@dduportal make sense :)

Let's add a 1337case to the mix for the next one then!

d154bl350urc31npu7: true