The minibrowser example was created using the Qt Creator templates,
which includes hard-coded install paths defined in deployment.pri.
For user applications that might make sense, but it doesn't for Qt
examples, instead we should install it into Qt's example directory.

Task-number: QTBUG-49431
Change-Id: Ia4c33574547a17a186125f10b3eaa14512f81dc8
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>