apps: Fixing bug with randomization configuration of ndn::ConsumerCbr

Thanks to Junxiao Shi for reporting the bug.

fixes #35
diff --git a/apps/ndn-consumer-cbr.cc b/apps/ndn-consumer-cbr.cc
index 6ddedd8..431f9ba 100644
--- a/apps/ndn-consumer-cbr.cc
+++ b/apps/ndn-consumer-cbr.cc
@@ -111,7 +111,7 @@
   if (m_random)
     delete m_random;
 
-  else if (value == "uniform")
+  if (value == "uniform")
     {
       m_random = new UniformVariable (0.0, 2 * 1.0 / m_frequency);
     }