Fix order button tooltips not disappearing on mouse exit

[lL1l1]

Issue

#6173 broke the mouse exit behavior because it didn't update all usages of the tooltip, under the incorrect assumption that the create function would return a Control that can be destroyed by the rest of the code like usual.

Description of the proposed changes

Update the remaining code for the order button tooltips to use the Tooltip class correctly.

Testing done on the proposed changes

Mouse over order buttons then move the mouse away and the tooltips should disappear. Previously the order button tooltips would only disappear when a new tooltip was created.

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in the changelog for the next game version

[lL1l1]

This has some mod conflicts when they try to add new order buttons :/
Mods: M28AI, Advanced Target Priorities Tweaked