existing devfs_rules with single quotes are not properly loaded in edit HTML form

[ttaeschn]

devfsrules like add path 'unlpt*' group cups' (containing single quote characters) can be added fine through the interface. After loading the values from config.xml again the rules (containing single quote characters) appear cut off add path in the edit box of the html form.
Other rules are unchanged.

Reason is that the values read from config.xml are not HTML-encoded when entered into the HTML form.
Fix is available here: #35