examples: qmlsink: rename qrc file to avoid naming conflicts with older meson versions

Would get "Tried to create target "qt5-qmlsink_qrc", but a
target of that name already exists." with older meson versions.

Work around that by renaming the qrc file.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/633>

tests/examples/qt/qmlsink-dynamically-added/meson.build

@@ -2,7 +2,7 @@ sources = [
   'main.cpp',
 ]
 
-qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
+qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink-dyn-added.qrc')
 executable('qmlsink-dynamically-added', sources, qt_preprocessed,
     dependencies : [gst_dep, gstgl_dep, qt5qml_example_deps],
     c_args : gst_plugins_good_args,

tests/examples/qt/qmlsink-dynamically-added/play.pro

@@ -14,7 +14,7 @@ INCLUDEPATH += ../lib
 
 SOURCES += main.cpp
 
-RESOURCES += qmlsink.qrc
+RESOURCES += qmlsink-dyn-added.qrc
 
 # Additional import path used to resolve QML modules in Qt Creator's code model
 QML_IMPORT_PATH =