Fix the brief/full snapshot dumpsys

Bug: 188272116

'dumpsys package snapshot' has a brief mode and a full mode.  The
sense of the flag is backwards in the dump routine.  This fixes the
flag.

Test: Manual test after booting.
 * 'dumpsys package snapshot' - verify full listing
 * 'dumpsys package snapshot --full' - verify full listing
 * 'dumpsys package snapshot --brief' - verify brief listing

Change-Id: I8495efc87cec60195a19d16a4aab66609a603389

services/core/java/com/android/server/pm/SnapshotStatistics.java

@@ -625,7 +625,7 @@ public class SnapshotStatistics {
      * output.
      */
     public void dump(PrintWriter pw, String indent, long now, int unrecorded,
-                     int corkLevel, boolean full) {
+                     int corkLevel, boolean brief) {
         // Grab the raw statistics under lock, but print them outside of the lock.
         Stats[] l;
         Stats[] s;
@@ -639,7 +639,7 @@ public class SnapshotStatistics {
                   unrecorded, corkLevel);
         pw.println();
         dump(pw, indent, now, l, s, "stats");
-        if (!full) {
+        if (brief) {
             return;
         }
         pw.println();