Remove call to deprecated getDefaultDescription method

Author: jnoordsij

src/Illuminate/Console/Command.php

@@ -101,9 +101,7 @@ public function __construct()
  // Once we have constructed the command, we'll set the description and other
  // related properties of the command. If a signature wasn't used to build
  // the command we'll set the arguments and the options on this command.
- if (! isset($this->description)) {
- $this->setDescription((string) static::getDefaultDescription());
- } else {
+ if (isset($this->description)) {
  $this->setDescription((string) $this->description);
  }