[9] [XXS] RFR 8133232: [fs] Regex has redundant | in the char class

[Ivan Gerasimov]

Hello!

I noticed a redundant |-bar char in a couple of places in 
MimeTypesFileTypeDetector.java.
Would you please help review the trivial fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8133232
WEBREV: http://cr.openjdk.java.net/~igerasim/8133232/00/webrev/

Sincerely yours,
Ivan