We already support 4 page fonts, bump max chars to 1024

[mmosca]

bump max number of chars for displayport_msp.

This should allow unofficial 4 page font support. (Don't tell MrD-RC he can have a full screen pilot logo ;) )

[MrD-RC]

Ooooooh. Now we're talking. Full screen pilot logo, here I come!!!

[KatanaDon9]

Thanks guys! I found an added bonus thing we can do to make the INAV logo really stand out. I was working on a see through radar screen in the corners wondering if transparency would actually work, it totally does.... the INAV logo could have transparent elements looking very slick in the OSD... I will show you guys when I have some extra time. It also means other useful elements can be semi transparent, partially reducing the amount of clutter for those of us who basically make a full blown cockpit out of the OSD, I appreciate all the effort here and will be adding some real effort in the near future, still stitching together pieces of how things actually work... very low level programmer, not so good at abstraction.

[KatanaDon9]

Working - Tested with 4 page Walksnail format font 96x9216 pixels