replace wallet.set_fee calls

gui/android.py

@@ -825,7 +825,7 @@ def settings_loop():
                         fee = int(COIN * Decimal(fee))
                     except Exception:
                         modal_dialog('error','invalid fee value')
-                    wallet.set_fee(fee)
+                    config.set_key('fee_per_kb', fee)
                     set_listview()
 
             elif pos == "4":

gui/gtk.py

@@ -200,7 +200,7 @@ def run_settings_dialog(self):
     except Exception:
         show_message("error")
         return
-    self.wallet.set_fee(fee)
+    self.config.set_key('fee_per_kb', fee)
 
     try:
         nz = int( nz )

gui/qt/main_window.py

@@ -2574,7 +2574,6 @@ class ElectrumWindow(QMainWindow):
         fee_e.setAmount(self.config.get('fee_per_kb', bitcoin.RECOMMENDED_FEE))
         def on_fee(is_done):
             v = fee_e.get_amount() or 0
-            self.wallet.set_fee(v)
             self.config.set_key('fee_per_kb', v, is_done)
             if not is_done:
                 self.update_fee()