lighttpd: adjust Config.in to make check-package happy

lighttpd: adjust Config.in to make check-package happy

Commit b9d75c717e01aed474b7567c969236418e87eda8 ("lighttpd: add
optional pam support") introduced a new Config.in option, but
check-package was not happy about it:

package/lighttpd/Config.in:30: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/lighttpd/Config.in:31: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/lighttpd/Config.in:32: attributes order: type, default, depends on, select, help (http://nightly.buildroot.org/#_config_files)
package/lighttpd/Config.in:32: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/lighttpd/Config.in:33: should be indented with one tab (http://nightly.buildroot.org/#_config_files)
package/lighttpd/Config.in:34: help text: <tab><2 spaces><62 chars> (http://nightly.buildroot.org/#writing-rules-config-in)

This commit fixes those indentation and ordering issues.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>