TokenSelectorNew: workaround for QTBUG-62411, minor sizing fixes

ui/app/AppLayouts/Wallet/controls/TokenSelectorButton.qml

@@ -70,8 +70,8 @@ Control {
                 id: tokenSelectorIcon
                 objectName: "tokenSelectorIcon"
 
-                Layout.preferredWidth: 20
-                Layout.preferredHeight: 20
+                Layout.preferredWidth: 21
+                Layout.preferredHeight: 21
                 image.source: root.icon
             }
 

ui/app/AppLayouts/Wallet/panels/SearchableCollectiblesPanel.qml

@@ -124,6 +124,13 @@ Control {
                 section.property: "type"
                 section.delegate: StatusBaseText {
                     width: ListView.view.width
+
+                    // Fixed height as a workaround for the
+                    // https://bugreports.qt.io/browse/QTBUG-62411 bug
+                    // causing improper first item positioning in some cases
+                    // (overlapping with the section delegate)
+                    height: 50
+
                     color: Theme.palette.baseColor1
                     padding: Style.current.padding
                     bottomPadding: 0
@@ -164,6 +171,9 @@ Control {
                 icon.height: 12
                 text: qsTr("Back")
 
+                horizontalPadding: 21
+                bottomPadding: Style.current.halfPadding
+
                 onClicked: collectiblesStackView.pop(StackView.Immediate)
             }