academic/mendeleydesktop: Fixed dep info

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

academic/mendeleydesktop/README

@@ -4,11 +4,3 @@ management tool for desktop and web.
 
 Before you use Mendeley, make sure that you agree with the terms and
 conditions at http://www.mendeley.com/terms/
-
-Optional Dependency
-
-qt5 -- this is highly recommended (replacing Mendeley's bundled qt5) to
-be able to access all the functions if you use KDE5.  You need to use
-the option 'SYSTEM_QT5=yes', for example:
-
-   SYSTEM_QT5=yes ./mendeleydesktop.SlackBuild

academic/mendeleydesktop/mendeleydesktop.SlackBuild

@@ -71,7 +71,7 @@ find -L . \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
 # removing QT5 bundled libraries
-if [ "${SYSTEM_QT5:-no}" != "no" ]; then
+if [ "${SYSTEM_QT5:-yes}" != "no" ]; then
   rm -rf lib/qt
   rm bin/qt.conf
   rm -rf lib/$PRGNAM/plugins