update wp_target.rb

Refactor if else statement - wp_content_dir (credits: ethicalhack3r)

lib/wpscan/wp_target.rb

@@ -49,11 +49,7 @@ class WpTarget < WebSite
     fail "The target is responding with a 403, this might be due to a WAF or a plugin.\n" \
           'You should try to supply a valid user-agent via the --user-agent option or use the --random-agent option' if response.code == 403
 
-    if wp_content_dir
-      dir = wp_content_dir
-    else
-      dir = 'wp-content'
-    end
+    dir = wp_content_dir ? wp_content_dir : 'wp-content'
 
     if response.body =~ /["'][^"']*\/#{Regexp.escape(dir)}\/[^"']*["']/i
       wordpress = true