[M120 Migration][TCT] Fix viewport user-scalable web-tct issue(behavior test)

[M120 Migration][TCT] Fix viewport user-scalable web-tct issue(behavior test)

Value changing of |user-scalable| property of view point meta tag is not applied
instantly. Due to this, zooming gesture is not working even if |user-scalable|
is changed to |true|. To apply this change instantly, changed to make layout
after updating |user-scalable| property.

Reference:
https://review.tizen.org/gerrit/288621

Change-Id: Id9ac0b4180cdea4ba9668fd9abb414cb3964d2d4
Signed-off-by: Manjeet <manjeet.1@partner.samsung.com>