Fix droid sans usage in copyright declaration

1. Droid sans is included but not correctly implemented: in uosthesis.cls line 445 \fontfamily{fds}\selectfont does not work. Instead use \droidsans to change the font.
2. The incorrect quotation marks are used in the copyright statement. Change "Full thesis title" to ``Full thesis title''
3. There is an extra space after the \textcopyright{}