Revert vc_mgr_set_selected_result() execution condition

Revert vc_mgr_set_selected_result() execution condition

- Issue:
vc_mgr_set_selected_result() should be able to invoked if
vc_mgr_all_result_cb() returns false.

- Solution:
Previous commit changes the execution condition of
vc_mgr_set_selected_result() to be invoked only in
vc_mgr_all_result_cb(). However, according to the description of
vc_mgr_all_result_cb(), vc_mgr_set_selected_result() should be able to
be invoked if vc_mgr_all_result_cb() returns false. Thus, this patch
reverts the condition of vc_mgr_set_selected_result() and fixes the
description of vc_mgr_set_selected_result().

Change-Id: I330a150187698f8179a62956b32a8092986397b4
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>