fix: min_intron_length_ initialization in JunctionsExtractor

 - fixes griffithlab#188, min_intron_length_ was accidentaly set from min_anchor_len_

Author: TimD1

src/junctions/junctions_extractor.h

@@ -221,7 +221,7 @@ class JunctionsExtractor {
             strandness_(strandness1), 
             strand_tag_(strand_tag1), 
             min_anchor_length_(min_anchor_length1), 
-            min_intron_length_(min_anchor_length1), 
+            min_intron_length_(min_intron_length1), 
             max_intron_length_(max_intron_length1), 
             filter_flags_(filter_flags), 
             require_flags_(require_flags),