Appliance interaction menu is no longer cut off at the bottom

[moxian]

Summary

Bugfixes "Appliance interaction menu is no longer cut off at the bottom"

Purpose of change

Fixes #78177

Describe the solution

Let uilist do the sizing instead of trying to re-calculate the needed height in appliance interaction menu code.

Describe alternatives you've considered

Unlike the diff proposed by @ZhilkinSerg, I decided to leave the width of the input as it was - way wider than it needs to be - because I didn't see Serg's comment at the time of my commit I think it looks a bit better that way.

I think ideal solution would be to migrate the "header" of the interaction menu to imgui as well, but that's a bit beyond me for now.

Testing

tiles

smol tiles

curses

Additional context

two minor drive-by changes (i probably don't need to write this out but hey):

• While i was debugging this thing trying to understand how layout works, i was getting weird values for locals. I'm very rusty with C++, but I think ImVec2 title_size = {}; creates uninitialized (rather than zeroed) value which might be UB and might be bad. So I changed those to ImVec2 title_size = ImVec2(); (since ImVec2 conveniently has a nice zero constructor like that). There is no change in behaviour, but the locals in the debugger look a bit less confusing now.
• removed redundant imenu.setup(); in veh_app_interact::populate_app_actions(). The latter is only ever called in veh_app_interact::init_ui_windows(), and is always followed by imenu.setup(); anyway, so what's the point doing it twice.

[db48x]

Thank you!