analyzer: hide Browse button for valgrind path chooser on Windows
analyzer: hide Browse button for valgrind path chooser on Windows

Change-Id: If7bf02f5ab52f3f3330a8eea0669f619130bbe2f
Task-number: QTCREATORBUG-5441
Reviewed-on: http://codereview.qt.nokia.com/1658
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Robert Löhning <1f928983f879a6fe326acd94487f754cc16e1fe4@nokia.com>

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