Simplify template specs by removing the 1.8 unordered hash fix

[jarthod]

In #499 I noticed some template specs have a complex syntax for level 2 hash test where every possible output was manually specified, example:

      '{keys}' => [
        'semi,%3B,dot,.,comma,%2C',
        'dot,.,semi,%3B,comma,%2C',
        'comma,%2C,semi,%3B,dot,.',
        'semi,%3B,comma,%2C,dot,.',
        'dot,.,comma,%2C,semi,%3B',
        'comma,%2C,dot,.,semi,%3B'
      ],

This is legacy due to ruby 1.8 unordered hash so it's not necessary any more since Ruby 1.9, confirmed by this commit which introduced it: ccfce40

As addressable only supports ruby 2.2+ now, I believe we can remove this to make these specs easier to read and modify.