Fix the access issue to shared/res of web app

Fix the access issue to shared/res of web app

Other applications can't access the contents of ${pkg_path}/res/wgt/shared/res
because of SMACK denial.
So, the all contents of ${pkg_path}/res/wgt/shared/res should be in shared/res
to avoid SMACK error.

Also, we should consider delta update issue.
The issue is the signature validation check failure because of unsigned file.
In ${pkg_path}/shared/res, there can be generated files such as apps icon.
and there can be other application's data of shared/res in case of Hybrid package.
These files are unsigend one.
To fix the issue,
unlink and move back all original contents for ${pkg_path}/res/wgt/shared/res
before delta update.

Submit with :
	https://review.tizen.org/gerrit/#/c/139133/

Change-Id: I83718f109fbe4614c41977f4d680e65f007dad86
Signed-off-by: jongmyeongko <jongmyeong.ko@samsung.com>
(cherry picked from commit 1e4547168e14eb59fc18c6f586d9a67126587b04)