config parsing: be more tolerant when finding configs #353
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When looking for which config file to load by default (that is, without
invoking fvwm with '-f'), there is a long compatibility list of file
locations to look through.
Fix an off-by-one error in array assignment, and also break out of the
compatibility loop once we have found a config file to load -- we don't
want to clobber that file by continuing down the list; the first match
always wins, which for most people will be ~/.fvwm/config
Noticed by Brandon Martin (codedmart) on #fvwm IRC.