convert FindInPouDialog from wx.Frame to wx.Dialog

In this case FindInPouDialog Windows isn't listed in windows manager
on Alt-Tab. And it's not shown on top of other applications. For
example, previously the dialog was shown even on top of web browser or
word processor.

     1

{

     2

    "url":"ws://127.0.0.1:8888",

     3

    "realm":"Automation",

     4

    "ID":"wamptest",

     5

    "password":"1234567890",

     6

    "key":"ABCDEFGHIJ"

     7

}