Try to use unicodes instead of latex commands in regexes of findadv

[Kornel Benko]

The problem:

Open new lyx-file
insert
        unicode-insert 0x025c 0x1d08
Open adv-find dialog
search for unicode 0x025c OK
search for unicode 0x1d08 OK
search with regex for unicode 0x025c OK
search with regex for unicode 0x1d08 ==> NOT OK (because we are searching for
\textrevepsilon and this is mapped to 0x025c

The patch tries to address the issue so that while searching we try to use the unicode
representation instead of the latex command.

	Kornel
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