Rename accessibility services to apps.

Fixes: 127657530
Test: View strings.
Change-Id: I56ab9b5f12808e5af0d9fe2afa64629805c02f1c
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 3673af4..5cc0caa 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -10734,8 +10734,8 @@
 
     <!-- Summary for the accessibility usage preference in the Privacy page.  [CHAR LIMIT=NONE] -->
     <plurals name="accessibility_usage_summary">
-        <item quantity="one">1 service has full access to your device</item>
-        <item quantity="other"><xliff:g id="service_count">%1$d</xliff:g> services have full access to your device</item>
+        <item quantity="one">1 app has full access to your device</item>
+        <item quantity="other"><xliff:g id="service_count">%1$d</xliff:g> apps have full access to your device</item>
     </plurals>
 
     <!-- Title for notification channel slice. [CHAR LIMIT=NONE] -->