fix continued expression indentation when cperl-indent-parens-as-block in effect

When cperl-indent-parens-as-block is in effect, expressions are indented
incorectly:

if ($var1 == 1 &&
      $var2 == 2 &&
      $var3 == 3) {
  ...
}

this patch fixes the indentation:

if ($var1 == 1 &&
    $var2 == 2 &&
    $var3 == 3) {
  ...
}