qtgraphicaleffects: Don't use PN in PN-dev RDEPENDS

* fix do_rootfs for images with dev-pkgs in IMAGE_FEATURES
  | Collected errors:
  |  * satisfy_dependencies_for: Cannot satisfy the following dependencies for qtgraphicaleffects-dev:
  |  *     qtgraphicaleffects (= 5.1.0-r0) *
  |  * opkg_install_cmd: Cannot install package qtgraphicaleffects-dev.

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>