Use DataUsageFormatter to format app data usage

Use the new unitsContentDescription from Formatter.formatBytes()

Fix: 318780411
Test: manual - on AppDataUsage
Test: unit test
Change-Id: I55079c83db2e46a48f49f746f2371825ec0bb029

src/com/android/settings/spa/app/appinfo/AppDataUsagePreference.kt

@@ -113,7 +113,7 @@ private class AppDataUsagePresenter(
         } else {
             context.getString(
                 R.string.data_summary_format,
-                appUsageData.formatUsage(context),
+                appUsageData.formatUsage(context).displayText,
                 appUsageData.formatStartDate(context),
             )
         }