fix: unit format() shouldnt ignore $addSymbol (#9)

* Ensuring unit format doesn't ignore $addSymbol

* Removing trailing whitespace

Author: neilcrookes

src/Unit.php

@@ -434,17 +434,20 @@ public function substract()
      */
     public function format($precision = 3, $addSymbol = true)
     {
-        $symbol = $this->getSymbol();
+        $format = '%02.' . $precision . 'f';
 
-        if (!empty($symbol)) {
-            $format = '%02.' . $precision . 'f %s';
+        if (!$addSymbol) {
+            return sprintf($format, $this->getValue());
+        }
 
-            return sprintf($format, $this->getValue(), $symbol);
-        } else {
-            $format = '%02.' . $precision . 'f';
+        $symbol = $this->getSymbol();
 
+        if (empty($symbol)) {
             return sprintf($format, $this->getValue());
         }
+
+        $format .= ' %s';
+        return sprintf($format, $this->getValue(), $symbol);
     }
 
     /**