qt-creator: pass correct IDE_LIBRARY_BASENAME

Fix QA issue when enable multilib:
ERROR: QA Issue: qt-creator: Files/directories were installed but not shipped in any package:
  /usr/lib
  /usr/lib/qtcreator
  /usr/lib/qtcreator/libQmlJS.so.1
  /usr/lib/qtcreator/libQmlEditorWidgets.so
  /usr/lib/qtcreator/libUtils.so.1
  /usr/lib/qtcreator/libCPlusPlus.so
  [snip]
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install. [installed-vs-shipped]

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>