Decide to enable double tap or not after minimumScale value is adjusted.

Decide to enable double tap or not after minimumScale value is adjusted.

[Title] Decide to enable double tap or not after minimumScale value is adjusted.
[Issue#] N_SE-50260, N_SE-50242
[Problem] The tap is not recognized in the WebApp when we do tap twice quickly.
[Cause] The two taps should be recognized correctly, but they are recognized as double tap
        when Web App does not set the user-scalable to 0 in the viewport meta tag.
        It is because the minimumScale value is calculated wrong only in the WVGA in this case.
[Solution] Decide to enable double tap or not after minimumScale value is adjusted.

Change-Id: I97ac959a0f845c4c7d5ed49ca560f31904ab5bc6