[otexplorer] Minor: Table name spelling doesn't match table tag

Nit/Minor issue observed when using otexplorer:

`$ cargo r /Users/drott/dev/color-fonts/build/test_glyphs-glyf_colr_1.ttf -q post | less`

starts outputting

```
┌─────────────────────────────────────────────────────────────┬─────────────┐
│Post │ │
│ version: 2.0 │ 00 02 00 00 │
```

I.e. `Post` vs `post` - IMO it'd make it more consistent if the capitalization would match the tag name.

Similarly `COLR` vs. `Colr`.

Start by running the reported `cargo r ... -q post` command and inspect the otexplorer entry point that formats table names and tags. Compare the output for `post` and `COLR`; done means the displayed table names use the same capitalization as their tags.

Written by the indexing model from the issue text.