fix(Mint token): Network selector not shown properly

Fixes 2 problems, mainly visible when switching between test and non-test
networks:
- do not display network icons in single selection mode
- make really sure the default chain is Optimism

Fixes #11846

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

@@ -66,7 +66,7 @@ StatusComboBox {
         readonly property bool noneSelected: (!!root.enabledNetworks) ? root.enabledNetworks.count === 0 : false
 
         // Persist selection between selectPopupLoader reloads
-        property var currentModel: layer1Networks
+        property var currentModel: layer2Networks
         property int currentIndex: 0
     }
 
@@ -116,7 +116,7 @@ StatusComboBox {
             visible: !d.allSelected && chainRepeater.count > 0
             Repeater {
                 id: chainRepeater
-                model: root.enabledNetworks
+                model: root.multiSelection ? root.enabledNetworks : []
                 delegate: StatusRoundedImage {
                     width: 24
                     height: 24

ui/app/AppLayouts/Wallet/stores/NetworkSelectPopup/SingleSelectionInfo.qml

@@ -3,6 +3,6 @@ import QtQml 2.15
 /// Inline component was failing on Linux with "Cannot assign to property of unknown type" so we need to use a separate file for it.
 QtObject {
     property bool enabled: false
-    property var currentModel: root.layer1Networks
+    property var currentModel: root.layer2Networks
     property int currentIndex: 0
 }