[Tizen][Runtime] Check the package type using application id instead.

Crosswalk runtime will check an installed web application type according to the
configure file name, if there's config.xml, it represents a WGT package, and
manifest.json represents an XPK package. But if a package have both of them,
it's always identified as XPK package, no matter it's actually a WGT or XPK
package. The patch will change to check the package type using the application
id, the tizen style app id represents a WGT package, xpk style id will be
identified as XPK package.

BUG=XWALK-2220
why the existing package type initialization code is not removed?