d20c9364ef
Tries to remove differences caused by filesystem-order in the generated .pot file.
The crowdin activity stream is full of events:
```
SomberNight_CI_BOT changed the context of 126 strings
02:42
String Previous context New context File Time
{} blocks #: electrum/gui/qt/channel_details.py:256 #: electrum/gui/qt/channel_details.py:257 electrum/gui/qt/network_dialog.py:514 #: electrum/gui/qt/network_dialog.py:514 electrum/gui/qt/channel_details.py:256 #: electrum/gui/qt/channel_details.py:257 messages.pot 02:42
[...]
```
^ i.e. on every CI push, the comments containing the file paths and line-numbers were getting mixed up randomly
This is undesirable noise.