Update preview code of formatter config indent tab

Written in the IDE, then converted to a java-ish "multi-line string"
with

    xclip -o | while IFS='' read line; do echo '+ "'"$line"'\n"'; done

The somewhat contrived 'hash' getter is intended to demonstrate the
effect of the 'indentationAfterSpecifierExpressionStart' option, which
is pretty exotic (intended mainly for hierarchical data structures).
See ceylon/ceylon.formatter#37.