Reduce logging for unknown camera scope

Still log a warning, but remove stack trace logging.

Change-Id: I28e47feb5d2700fd05e7ff4e6faeb1d5a9e38de5
diff --git a/src/com/android/camera/CameraActivity.java b/src/com/android/camera/CameraActivity.java
index e5237d8..07215cc 100644
--- a/src/com/android/camera/CameraActivity.java
+++ b/src/com/android/camera/CameraActivity.java
@@ -1007,8 +1007,7 @@
             // some automated scenarios, just return it as a valid separate scope
             // this could cause user issues, so log a stack trace noting the call path
             // which resulted in this scenario.
-            Log.w(TAG, "getting camera scope with no open camera, using id: " + currentCameraId,
-                    new Exception());
+            Log.w(TAG, "getting camera scope with no open camera, using id: " + currentCameraId);
         }
         return CAMERA_SCOPE_PREFIX + Integer.toString(currentCameraId);
     }