codec2: increase max dequeue output buffer count

Add # of input slots to max dequeue buffer count for output buffers.
If pipeline is paused, # of output buffers could be whole pipeline depth
including # of input slots.

Bug: 137150765
Merged-In: I5fce613a383160ea8a49e77f67628f85408cdcfa
Change-Id: I5fce613a383160ea8a49e77f67628f85408cdcfa
(cherry picked from commit 7a7b742c7a708406ae0d468f03244e6a994ee9c9)
diff --git a/media/codec2/sfplugin/PipelineWatcher.cpp b/media/codec2/sfplugin/PipelineWatcher.cpp
index 74d14e8..0ee9056 100644
--- a/media/codec2/sfplugin/PipelineWatcher.cpp
+++ b/media/codec2/sfplugin/PipelineWatcher.cpp
@@ -146,7 +146,7 @@
               std::chrono::duration_cast<std::chrono::milliseconds>(elapsed).count());
         durations.push_back(elapsed);
     }
-    std::nth_element(durations.begin(), durations.end(), durations.begin() + n,
+    std::nth_element(durations.begin(), durations.begin() + n, durations.end(),
                      std::greater<Clock::duration>());
     return durations[n];
 }