StandardDropdown: drop Qt 5.8 workaround

pages/Transfer.qml

@@ -118,7 +118,6 @@ Rectangle {
         amountLine.text = ""
         setDescription("");
         priorityDropdown.currentIndex = 0
-        updatePriorityDropdown()
     }
 
     // Information dialog
@@ -397,6 +396,7 @@ Rectangle {
                   id: priorityDropdown
                   Layout.topMargin: 5
                   currentIndex: 0
+                  dataModel: priorityModelV5
               }
           }
       }
@@ -745,12 +745,6 @@ Rectangle {
     function onPageCompleted() {
         console.log("transfer page loaded")
         updateStatus();
-        updatePriorityDropdown()
-    }
-
-    function updatePriorityDropdown() {
-        priorityDropdown.dataModel = priorityModelV5;
-        priorityDropdown.update()
     }
 
     //TODO: Add daemon sync status

pages/settings/SettingsLayout.qml

@@ -196,6 +196,7 @@ Rectangle {
                 MoneroComponents.StandardDropdown {
                     id: fiatPriceCurrencyDropdown
                     Layout.fillWidth: true
+                    currentIndex: persistentSettings.fiatPriceCurrency === "xmrusd" ? 0 : 1
                     dataModel: fiatPriceCurrencyModel
                     onChanged: {
                         var obj = dataModel.get(currentIndex);
@@ -281,10 +282,6 @@ Rectangle {
             i += 1;
         }
 
-        fiatPriceProviderDropDown.update();
-        fiatPriceCurrencyDropdown.currentIndex = persistentSettings.fiatPriceCurrency === "xmrusd" ? 0 : 1;
-        fiatPriceCurrencyDropdown.update();
-
         console.log('SettingsLayout loaded');
     }
 }

pages/settings/SettingsLog.qml

@@ -231,9 +231,6 @@ Rectangle {
     }
 
     Component.onCompleted: {
-        logLevelDropdown.currentIndex = appWindow.persistentSettings.logLevel;
-        logLevelDropdown.update();
-
         if(typeof daemonManager != "undefined")
             daemonManager.daemonConsoleUpdated.connect(onDaemonConsoleUpdated)
     }