askrene: refactor get_routes

Prefer the following programming pattern:

do_getroutes(){
        do_something1();
        do_something2();
        do_something3();
}

rather than

get_routes(){
        do_something1();
        do_something2();
}

do_getroutes(){
        get_routes();
        do_something3();
}

Changelog-None

Signed-off-by: Lagrang3 <lagrang3@protonmail.com>

Author: Lagrang3