Fix qwavedecoder test data deployment on device

- Device deployment changed to use DEPLOYMENT instead of INSTALLS for
test data files
- Test data deployment target fixed to go under binary
installation directory instead of the build directory

Change-Id: I4b0007f9309767083a4a5dfa6f3dc26f3c36c330
Reviewed-on: http://codereview.qt-project.org/6573
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

tests/auto/qwavedecoder/qwavedecoder.pro

@@ -6,8 +6,7 @@ SOURCES += tst_qwavedecoder.cpp \
 QT += multimedia-private testlib network
 CONFIG += no_private_qt_headers_warning testcase
 
-data.files = data
-data.path = $${OUT_PWD}
-
-INSTALLS += data
+data.files = data/*
+data.path = data
+DEPLOYMENT += data