Fixed "Select Month" popup does not appear after long tap on Month text field in...

Fixed "Select Month" popup does not appear after long tap on Month text field in Entry window in TizenWinset.

[Title] Fixed "Select Month" popup does not appear after long tap on Month text field in Entry window in TizenWinset.
[Issue#] N_SE_38090
[Problem] "Select Month" popup does not appear after long tap on Month text field in Entry window in TizenWinset.
[Cause] Caret selection is working when input type is picker type and string is empty.
        So, caret is shown and input picker is not shwon
[Solution] Do not perform selection operation when input type is picker type and string is empty.
            - picker type : "date", "datetime", "datetime-local", "month", "time" or week"

Change-Id: I7ac5373a69bd121134293457ea9caae74435ac3d