enable gui switch button (classic <-> lite) both ways

lib/gui_lite.py

@@ -302,15 +302,18 @@ class MiniWindow(QDialog):
         self.receive_button.setObjectName("receive_button")
         self.receive_button.setDefault(True)
 
-        main_layout = QGridLayout(self)
+        self.switch_button = QPushButton( QIcon(":icons/switchgui.png"),'' )
+        self.switch_button.clicked.connect(expand_callback)
 
-        main_layout.addWidget(self.balance_label, 0, 0)
-        main_layout.addWidget(self.receive_button, 0, 1)
+        main_layout = QGridLayout(self)
 
-        main_layout.addWidget(self.address_input, 1, 0)
+        main_layout.addWidget(self.switch_button, 0, 0)
+        main_layout.addWidget(self.balance_label, 0, 1)
+        main_layout.addWidget(self.receive_button, 0, 2)
 
-        main_layout.addWidget(self.amount_input, 2, 0)
-        main_layout.addWidget(self.send_button, 2, 1)
+        main_layout.addWidget(self.address_input, 1, 0, 1, 3)
+        main_layout.addWidget(self.amount_input, 2, 0, 1, 2)
+        main_layout.addWidget(self.send_button, 2, 2)
 
         self.history_list = history_widget.HistoryWidget()
         self.history_list.setObjectName("history")

lib/gui_qt.py

@@ -1158,8 +1158,8 @@ class ElectrumWindow(QMainWindow):
         sb = QStatusBar()
         sb.setFixedHeight(35)
         qtVersion = qVersion()
-        # if (int(qtVersion[0]) >= 4 and int(qtVersion[2]) >= 7):
-        #     sb.addPermanentWidget( StatusBarButton( QIcon(":icons/switchgui.png"), "Switch to Lite Mode", self.go_lite ) )
+        if (int(qtVersion[0]) >= 4 and int(qtVersion[2]) >= 7):
+             sb.addPermanentWidget( StatusBarButton( QIcon(":icons/switchgui.png"), "Switch to Lite Mode", self.go_lite ) )
         if self.wallet.seed:
             sb.addPermanentWidget( StatusBarButton( QIcon(":icons/lock.png"), "Password", lambda: self.change_password_dialog(self.wallet, self) ) )
         sb.addPermanentWidget( StatusBarButton( QIcon(":icons/preferences.png"), "Preferences", self.settings_dialog ) )