Fix QML glitches and crash on iOS (#658)

Fix QML glitches and crash on iOS and Android

client/ui/qml/Pages2/PageHome.qml

@@ -165,7 +165,7 @@ PageType {
         expandedContent: Item {
             id: serverMenuContainer
 
-            implicitHeight: root.height * 0.9
+            implicitHeight: Qt.platform.os !== "ios" ? root.height * 0.9 : screen.height * 0.77
 
             Component.onCompleted: {
                 drawer.expandedHeight = serverMenuContainer.implicitHeight
@@ -252,7 +252,7 @@ PageType {
                             model: SortFilterProxyModel {
                                 id: proxyDefaultServerContainersModel
                                 sourceModel: DefaultServerContainersModel
-                                
+
                                 sorters: [
                                     RoleSorter { roleName: "isInstalled"; sortOrder: Qt.DescendingOrder }
                                 ]

client/ui/qml/Pages2/PageSettingsServerInfo.qml

@@ -130,7 +130,7 @@ PageType {
                         }
 
                         Component.onCompleted: {
-                            if (header.itemAt(0)) {
+                            if (header.itemAt(0) && !GC.isMobile()) {
                                 defaultActiveFocusItem = serverName.textField
                             }
                         }