Fix end-of-input-handling in silence trimmer

git-svn-id: svn://localhost/ardour2/branches/3.0@13160 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/audiographer/audiographer/general/silence_trimmer.h

@@ -259,6 +259,9 @@ class SilenceTrimmer
 			}
 			ListedSource<T>::output (c_out);
 		}
+
+		// Add the flag back if it was removed
+		if (end_of_input) { c.set_flag (ProcessContext<T>::EndOfInput); }
 	}