Editing the title of an event reschedules it to today's next whole hour

[cassidyjames]

Looks to be a regression from #209. Might require pressing Enter in the event name when editing, I haven't fully tracked down when it happens but it's fairly reproducible.

[Thalexander]

ParserEn (line 185) and ParserDe (line 150) both work by assuming the time as being today's next whole hour and the modify that based on the text, the parsing runs on enter in the event title and so causes this issue. This does not occur repeatedly in the same panel though as parsing only happens once, so changing the event name again without saving and then pressing enter will just save the event rather than re-parsing. Unrelated to #209, although it uses the previous logic for the next whole hour, we may want to change that to match the new behaviour.

It will reset the to and from dates and times, the all day toggle, and the location. It will not however change the participants because that doesn't work even if parsed, if parsed it just adds the names to the text entry box in the guests panel but doesn't add them.