Indent PTT controls on AudioPage

The PTT controls were grouped in a ColumnLayout with the microphone
device and volume controls. Grouping the microphone controls together
mirrors what is done with the mirror device controls.

src/res/qml/audio_page/AudioPage.qml

@@ -116,7 +116,9 @@ MyStackViewPage {
                     }
                 }
             }
-
+        }
+        ColumnLayout {
+            spacing: 18
             MyToggleButton {
                 id: audioMuteProximitySensorToggle
                 Layout.preferredWidth: 600

src/res/qml/audio_page/device_selector/MicDeviceSelector.qml

@@ -23,7 +23,7 @@ RowLayout {
         Layout.minimumWidth: 850
         Layout.preferredWidth: 850
         onActivated: {
-            if (componentCompleted) {
+            if (deviceIndex >= 0) {
                 AudioTabController.setMicDeviceIndex(currentIndex)
             }
         }