Fix delay line out-of-bounds port access

src/delay.cpp

@@ -88,7 +88,7 @@ class DelayLine : public CMT_PluginInstance {
 
   DelayLine(const unsigned long lSampleRate,
 	    const LADSPA_Data fMaximumDelay) 
-    : CMT_PluginInstance(4),
+    : CMT_PluginInstance(5),
       m_fSampleRate(LADSPA_Data(lSampleRate)),
       m_fMaximumDelay(fMaximumDelay) {
     /* Buffer size is a power of two bigger than max delay time. */