Fix rooftop shooting

[Bejofo]

Summary

Bugfixes "Fix rooftop shooting"

Purpose of change

Fixes #49743 and #46333 hopefully.

Describe the solution

Whenever the bullet trajectory changes z-levels, check both tiles if there is a floor in between. This should still prevent the player
from shooting directly through the floor.

Testing

Compiled the game, and was able to shoot enemies as expected. Can also shoot enemies directly adjacent to you from rooftops.

Additional context

I might have screwed up the whitespace, I'm not sure how to edit commits.
Also my first time writing c++, I don't know what I'm doing.

[BrettDong]

On code formatting: https://github.com/CleverRaven/Cataclysm-DDA/blob/master/doc/DEVELOPER_TOOLING.md#code-style-astyle

[Maleclypse]

Are you on windows? If you are on windows and have downloaded astyle you can create new notepad file. Type the following

echo off
cd Cataclysm-DDA

astyle --options=.astylerc --recursive src/*.cpp,*.h tests/*.cpp,*.h object_creator/*.cpp,*.h

then save the file as astyle.bat then double click it and it should astyle your file for you.