tests: clip: fix test_rate_effects_duration_limit
Fix this assertion: g_value_copy: assertion 'g_value_type_compatible (G_VALUE_TYPE (src_value), G_VALUE_TYPE (dest_value))' failed
'tempo' is a float, not a double.
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Fix this assertion: g_value_copy: assertion 'g_value_type_compatible (G_VALUE_TYPE (src_value), G_VALUE_TYPE (dest_value))' failed
'tempo' is a float, not a double.