Fixes for Floor Items addon

[StephenCWills]

Various fixes to the Floor Items addon.

• When the ignoreMeseta option is set to true, the addon would still add the newlines for the meseta to the overlay, leaving superfluous blank lines in the display.
• A typo when setting the untekked flag on weapons caused the addon to fail to display the [U] indicator to show that the item is untekked.
• The weapon special was not being masked properly. This logic was copied from the Character Reader addon and so is assumed to be correct. Testing seems to indicate that it works.

[Solybum]

• The weapon special was not being masked properly. Yeah, the byte that has the special has the wrapped as well as the untekked flags. It's a combination of bitflags and a "normal" number, flags 0x40 and 0x80 (0xC0 both) and the special is up to 0x3F