mmdeduction.raw.html: Change to HTML encoding & not ;
mmdeduction.raw.html: Change to HTML encoding & not ;

Change per suggestion from @benjub.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

metamath/set.mm,metamath/set.mm,metamath/set.mm