lib/utils: Code quality improvement (#103)

Fixed by suggestion 
https://github.com/ohmybash/oh-my-bash/issues/68#issuecomment-523238232

Bug: https://github.com/ohmybash/oh-my-bash/issues/68

lib/utils.sh

@@ -158,10 +158,7 @@ is_confirmed() {
 # fi
 #
 type_exists() {
-  if [ "$(type -P "$1")" ]; then
-    return 0
-  fi
-  return 1
+  [ "$(type -P "$1")" ]
 }
 
 #