The XDG Desktop Entry spec mentions that multiple values per key may be
optionally terminated by a semicolon. An example for this is the Firefox
desktop file, which has no trailing semicolon. This breaks the sed regex
used in `mimeAssociations`.
Fix the regex by matching the end of string, optionally preceded by a
semicolon, or any other semicolon. This makes it work with both
semicolon-terminated and non-semicolon-terminated desktop files.
0b7fd187e2