test: dialog: use test_init()
test_init() will already setup VLC_PLUGIN_PATH and VLC_LIB_PATH, while setting up the alarm() for the test timeout, using VLC_TEST_TIMEOUT instead of ad-hoc value.
test_init() will already setup VLC_PLUGIN_PATH and VLC_LIB_PATH, while setting up the alarm() for the test timeout, using VLC_TEST_TIMEOUT instead of ad-hoc value.
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