fix incorrect FSF address

plugins/hextray/hexchat.cpp

@@ -13,7 +13,7 @@
  * 
  * You should have received a copy of the GNU General Public License
  * along with X-Tray; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
 #include <windows.h>
@@ -317,4 +317,4 @@ void hexchat_exec(char *command)
 {
 	hexchat_set_context(ph, hexchat_find_context(ph, NULL, NULL));
 	hexchat_command(ph, command);
-}
+}