convert_integer_literal not on selected

[A4-Tacks]

convert_integer_literal can only convert the first literal,
it is not reasonable to apply it when selected

Example

fn main() {
    $01+1$0;
}

Assist old outputs:

Convert 1 to 0b1
Convert 1 to 0o1
Convert 1 to 0x1
Replace arithmetic with call to checked_*
Replace arithmetic with call to saturating_*
Replace arithmetic with call to wrapping_*
Extract into variable
Extract into constant
Extract into static
Extract into function

Assist this PR outputs:

Replace arithmetic with call to checked_*
Replace arithmetic with call to saturating_*
Replace arithmetic with call to wrapping_*
Extract into variable
Extract into constant
Extract into static
Extract into function

[ChayimFriedman2]

Hmm... I think it does make sense to activate it if only the literal is selected. But I guess it doesn't matter a lot.

Thanks!