[13.0.0-beta.4] shortcut_formatting.ts has incorrect Msg key references

[microbit-matt-hillsdon]

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Description

What's referenced as ESCAPE_KEY is actually ESCAPE in messages.
Similarly CTRL_KEY is actually CONTROL_KEY in messages.

Spotted by Claude and confirmed by me logging the object (they're the only two that are undefined) so I haven't worked through any user visible impact.

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