Stop setting `key.meta` to `true` when Escape is pressed

The `|| keypress.name === 'escape'` clause was a backward-compat shim added in 6f99ca3 with an explicit TODO to remove it in the next major version. The parser already computes `meta` correctly: `false` for a single escape, `true` for double-escape (Alt+Escape). The shim was overriding that.