crash reporter: propagate HTTP error as exception

which will then get displayed as an error, and not as if we succeeded sending...

electrum/base_crash_reporter.py

@@ -75,7 +75,7 @@ class BaseCrashReporter(Logger):
 
     async def do_post(self, proxy, url, data):
         async with make_aiohttp_session(proxy) as session:
-            async with session.post(url, data=data) as resp:
+            async with session.post(url, data=data, raise_for_status=True) as resp:
                 return await resp.text()
 
     def get_traceback_info(self):

electrum/gui/qt/exception_window.py

@@ -117,7 +117,7 @@ class Exception_Window(BaseCrashReporter, QWidget, MessageBoxMixin, Logger):
             self.logger.error('There was a problem with the automatic reporting', exc_info=exc_info)
             self.show_critical(parent=self,
                                msg=(_('There was a problem with the automatic reporting:') + '<br/>' +
-                                    repr(e)[:120] + '<br/>' +
+                                    repr(e)[:120] + '<br/><br/>' +
                                     _("Please report this issue manually") +
                                     f' <a href="{constants.GIT_REPO_ISSUES_URL}">on GitHub</a>.'),
                                rich_text=True)