.dir-locals.el: Don't mess up indentation of prepend and append.

.dir-locals.el: Don't mess up indentation of prepend and append.

The current version appears to assume special values in the first and second
package, but it's either all lists (default append) or all package input
expressions (inside modify-inputs), which themselves are either packages
or lists consisting of a package and a string.

* .dir-locals.el: Drop (eval . (put 'prepend 'scheme-indent-function 2))
and (eval . (put 'append 'scheme-indent-function 2)).