Bravura.svg: units-per-em="1000" but many glyphs use 1024

Don't know if this is a bug...

For example:

```
<glyph glyph-name="uniE851" unicode="&#xe851;" horiz-adv-x="363" 
d="M360 1024v-1024h-360v1024h360zM192 774h144v185h-144v-185zM24 774h144v185h-144v-185zM336 524v226h-144v-226h144zM168 524v226h-144v-226h144zM336 274v226h-144v-226h144zM168 274v226h-144v-226h144zM336 24v226h-144v-226h144zM168 24v226h-144v-226h144z" />

```
