Modifying path for db files

Modifying path for db files

Browser crashes due to the error below.
>> Error while starting transaction
>> UNHANDLED EXCEPTION attempt to write a readonly database

Platform only allows following path to access db files.
>> /home/{ACCOUNT}/.applications/dbspace/

This patch supports multi-user mode and fixes the crash.

However, this should be reverted later
once multi-user db is supported via browser-provider.

Change-Id: I2a2cf7d3956dbba37653b773b203706f866e96a9
Signed-off-by: Youngsoo Choi <kenshin.choi@samsung.com>