Renamed string.xml to strings.xml to match Android convention

Bug: 68844134
Test: n/a
PiperOrigin-RevId: 175102999
Change-Id: I63e930809d4bb96669062f724fb9cab90d675afa
diff --git a/java/com/android/dialer/assisteddialing/ui/res/values/string.xml b/java/com/android/dialer/assisteddialing/ui/res/values/strings.xml
similarity index 100%
rename from java/com/android/dialer/assisteddialing/ui/res/values/string.xml
rename to java/com/android/dialer/assisteddialing/ui/res/values/strings.xml