Update verification for callback file in WebView

[charleston10]

Problem

There was a problem when the user triggered the component of "Input File" through the webview, was not returning the file captured by the android camera

Tested in OS Version

• [x] KitKat 4.4
• [x] Lollipop 5.0 - 5.11
• [x] Marshmallow 6.0 - 6.0.1
• [x] Nougat 7.0 - 7.1.2
• [x] Oreo 8.0 - 8.0.1
• [x] Pie 9.0

references

#2