BUG: Removed ${QT_LIBRARIES} from app ctkDICOM and ctkDICOMIndexer, Qt libraries

shouldn't be required since CTKDICOMCore is linked against CTKCore which
is finally linked against {QT_LIBRARIES}.
Same remark applied for CTKDICOMWidgets which is linked against CTKDICOMCore

Applications/ctkDICOM/target_libraries.cmake

@@ -5,6 +5,5 @@
 # 
 
 SET(target_libraries
-  ${QT_LIBRARIES}
   CTKDICOMWidgets
   )

Applications/ctkDICOMIndexer/target_libraries.cmake

@@ -5,6 +5,5 @@
 # 
 
 SET(target_libraries
-  ${QT_LIBRARIES}
   CTKDICOMCore
   )