fix codacy warnings of unused functions

Author: JBlond

lib/jblond/Diff/Renderer/Html/HtmlArray.php

@@ -225,9 +225,9 @@ private function getChangeExtent(string $fromLine, string $toLine)
     protected function formatLines(array $lines) : array
     {
         if ($this->options['tabSize'] !== false) {
-            $lines = array_map(array($this, 'ExpandTabs'), $lines);
+            $lines = array_map(function ($item){ return $this->expandTabs($item); }, $lines);
         }
-        $lines = array_map(array($this, 'HtmlSafe'), $lines);
+        $lines = array_map(function($item){ return $this->htmlSafe($item); }, $lines);
         foreach ($lines as &$line) {
             $line = preg_replace_callback('# ( +)|^ #', array($this, 'fixSpaces'), $line);
         }

lib/jblond/Diff/SequenceMatcher.php

@@ -641,7 +641,7 @@ public function getGroupedOpcodes(int $context = 3) : array
      */
     public function ratio() : float
     {
-        $matches = array_reduce($this->getMatchingBlocks(), array($this, 'ratioReduce'), 0);
+        $matches = array_reduce($this->getMatchingBlocks(), function($sum, $triple){ return $this->ratioReduce($sum, $triple); }, 0);
         return $this->calculateRatio($matches, count($this->a) + count($this->b));
     }