no swupd state data removing in 1st build stage

During the 1st stage build of multi-stage build, when
run swupd os-install, the swupd state data are saved to
/swupd_state, which will not be copied to the target.
So we do not need to remove swupd state data.

Signed-off-by: Liu, Jianjun <jianjun.liu@intel.com>

httpd/Dockerfile

@@ -15,8 +15,7 @@ RUN source /os-release && \
     mkdir /install_root \
     && swupd os-install -V ${VERSION_ID} \
     --path /install_root --statedir /swupd-state \
-    --bundles=httpd --no-boot-update \
-    && rm -rf /install_root/var/lib/swupd/*
+    --bundles=httpd --no-boot-update
 
 # For some Host OS configuration with redirect_dir on,
 # extra data are saved on the upper layer when the same