tempfile used by kcmlisa

[Waldo Bastian]

kcmlisa creates a tempfile in /tmp which could theoretically be abused by a 
symlink attack to overwrite a file of the user. 

This patch fixes that. It also makes sure that the tempfile gets deleted in 
case e.g. kcmshell exits before the saveDone slot is called.

Please review. Thanks to Per Winkvist for pointing out the problem.

Cheers,
Waldo
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