Fixes #389 - wallet syncing in Qt

In commit 22467f4 a bug was introduced whereby detailed
sync was used instead of fast sync, but with only one
iteration, in Joinmarket-Qt, in certain circumstances,
leading to incorrect wallet reporting/display. This commit
reverts that change (except for function name change).
There may still be edge cases for large wallets doing
recovery in Qt but this will be dealt with later.

scripts/joinmarket-qt.py

@@ -1479,7 +1479,7 @@ class JMMainWindow(QMainWindow):
                                    title="Wallet created")
         self.initWallet(seed=self.walletname, restart_cb=self.restartWithMsg)
 
-    def selectWallet(self, testnet_seed=None):
+    def selectWallet(self, testnet_seed=None, restart_cb=None):
         if jm_single().config.get("BLOCKCHAIN", "blockchain_source") != "regtest":
             current_path = os.path.dirname(os.path.realpath(__file__))
             if os.path.isdir(os.path.join(current_path, 'wallets')):
@@ -1501,7 +1501,7 @@ class JMMainWindow(QMainWindow):
                 if not ok:
                     return
                 pwd = str(text).strip()
-                decrypted = self.loadWalletFromBlockchain(firstarg[0], pwd, restart_cb=self.restartWithMsg)
+                decrypted = self.loadWalletFromBlockchain(firstarg[0], pwd, restart_cb)
         else:
             if not testnet_seed:
                 testnet_seed, ok = QInputDialog.getText(self,