Main: change bug report link

This changes the link from the new issue page to the issue tracker. This
means that users can see if the issue has already been reported, and
won't be immediately sent to a sign in page if they aren't signed into
GitHub.

src/main.py

@@ -35,7 +35,7 @@ class Application(Gtk.Application):
 
 	APP_ID = 'com.github.maoschanz.drawing'
 	APP_PATH = '/com/github/maoschanz/drawing'
-	BUG_REPORT_URL = 'https://github.com/maoschanz/drawing/issues/new/choose'
+	BUG_REPORT_URL = 'https://github.com/maoschanz/drawing/issues'
 	FLATPAK_BINARY_PATH = '/app/bin/drawing'
 	CURRENT_BINARY_PATH = ''
 
@@ -227,7 +227,7 @@ def on_new_window(self, *args):
 		return self.open_window_with_content(None)
 
 	def on_report(self, *args):
-		"""Action callback, opening a new issue on the github repo."""
+		"""Action callback, opening a page to the Github issue tracker."""
 		win = self.props.active_window
 		Gtk.show_uri_on_window(win, self.BUG_REPORT_URL, Gdk.CURRENT_TIME)