qt ConfirmTxDialog: don't catch BaseException for make_tx

not sure what it is supposed to catch...
The examples I could come up with would all be actual bugs;
in which case we should let the exception propagate out to the crash reporter.

electrum/gui/qt/confirm_tx_dialog.py

@@ -99,11 +99,6 @@ class TxEditor:
             self.tx = None
             self.main_window.show_error(str(e))
             raise
-        except BaseException as e:
-            self.tx = None
-            self.main_window.logger.exception('')
-            self.show_message(str(e))
-            return
         use_rbf = bool(self.config.get('use_rbf', True))
         if use_rbf:
             self.tx.set_rbf(True)