overlay: fix FPS, healthbar, and arrows from overlapping

[lahm86]

Resolves #787.

Checklist

• I have read the coding conventions
• I have added a changelog entry about what my pull request accomplishes, or it is an internal change

Description

This builds on @walkawayy's commit in #796 to fix:

• the healthbar sitting behind the INVENTORY or Small/Large Medi Pack text if it's set to be centre-top or centre-bottom;
• the inventory ring up/down arrow not re-appearing if FPS is toggled off while a medipack is highlighted;
• the FPS Y position in normal game being off-screen when no bars are set to be top-left.

This also changes the g_GameInfo.status behaviour to allow flag combinations, so we can define specifics within overall statuses, so in this instance when we are in the inventory and have a medipack highlighted.