The "htmlspecialchars" was butchering the entites-encoded output

The "htmlspecialchars" was butchering the entites-encoded output
provided by the decodeHeader(). E.g. if there was any non-ascii
characters in the "From:" line, the decodeHeader would return them
as entities, "&#NNNN;&#NNNN;....", and htmlspecialchars would reduce
this to "&#NNNN;&#NNNN...." which looked EXTRAORDINARILY
ugly when rendered in a browser.
This is a stop-gap measure -- htmlspecialchars should be called at some
point.

git-svn-id: https://svn.code.sf.net/p/squirrelmail/code/trunk/squirrelmail@2068 7612ce4b-ef26-0410-bec9-ea0150e637f0