Change the tooltip text in battery status icon for tethered devices

When using tethered devices instead of standalone headsets, the battery
level we show in the tray is the phone's so it does make sense to
use "Phone" instead of "Headset".

app/src/common/shared/com/igalia/wolvic/ui/widgets/TrayWidget.java

@@ -308,7 +308,7 @@ public void updateUI() {
                         .withDensity(R.dimen.tray_tooltip_density)
                         .withLayout(R.layout.tooltip)
                         .withString(getContext().getString(
-                                R.string.tray_status_headset,
+                                DeviceType.isTetheredDevice() ? R.string.tray_status_phone : R.string.tray_status_headset,
                                 String.format(
                                         LocaleUtils.getDisplayLanguage(
                                                 getContext()).getLocale(),

app/src/common/shared/com/igalia/wolvic/utils/DeviceType.java

@@ -161,4 +161,8 @@ public static String getDeviceName(Context aContext) {
         }
         return aContext.getString(R.string.device_name, appName, deviceName);
     }
+
+    public static boolean isTetheredDevice() {
+        return mType == HVR3DoF || mType == HVR6DoF || mType == VisionGlass || mType == LenovoA3;
+    }
 }

app/src/main/res/values/strings.xml

@@ -2532,5 +2532,7 @@ the Select` button. When clicked it closes all the previously selected tabs -->
 
     <!-- Shown in the tray wifi icon popup when SSID cannot be retrieved -->
     <string name="tray_wifi_unavailable_ssid">SSID unavailable</string>
+    <!-- Tooltip for the battery level when using a tethered device instead of a headset -->
+    <string name="tray_status_phone">Phone: %1$s</string>
 
 </resources>