fonts larger than 50 silently fail

[clach04]

https://github.com/pebble/rockyjs/blob/master/examples/text/index.html#L78 uses font size of 40, if this is modified to 50, works as expected (larger font, and text wraps on whitespace).

var font3 = fonts_load_custom_font({height: 40, url:"https://github.com/pebble-examples/feature-custom-font/raw/master/resources/fonts/osp-din/OSP-DIN.ttf"});

If line 78 is updated to use 51 (i.e one more) text vanishes without error.

Noticed whilst trying to port over one of my watchfaces from C api which needs size 75 (https://github.com/clach04/watchface_JupiterMass/blob/master/appinfo.json).

[ygalanter]

I concur. Please allow fonts with size over 50