SI-7345 Remove elaborate no-op from `typerReportAnyContextErrors`.

The reasoning is as follows:

 - There were only two callers to this, and they both passed in as `c`
   a child context of `context`
 - That child context must share the error reporting mode and buffer
    with `context`.
  - Therefore, extracting an error from `c` and issuing it into `context`
    is a no-op. Because the error buffer is Set, it was harmless.