Make CallScreening.CallResponse static

A small mistake in my previous CL. The response object
needs to be static.

Change-Id: Idf9bca7a7076275f53475c2531090f406daecab9
diff --git a/telecomm/java/android/telecom/CallScreeningService.java b/telecomm/java/android/telecom/CallScreeningService.java
index 1b6e162..f62b170 100644
--- a/telecomm/java/android/telecom/CallScreeningService.java
+++ b/telecomm/java/android/telecom/CallScreeningService.java
@@ -89,7 +89,7 @@
     /*
      * Information about how to respond to an incoming call.
      */
-    public class CallResponse {
+    public static class CallResponse {
         private final boolean mShouldDisallowCall;
         private final boolean mShouldRejectCall;
         private final boolean mShouldSkipCallLog;
@@ -140,7 +140,7 @@
             return mShouldSkipNotification;
         }
 
-        public class Builder {
+        public static class Builder {
             private boolean mShouldDisallowCall;
             private boolean mShouldRejectCall;
             private boolean mShouldSkipCallLog;