gst-inspect: fix printing the first field of a GstStructure
When printing a GstStructure property (e.g. the "stats" property in rtpsession) the first field is printed on the same line of the type description, and this is both inconsistent compared to how Enum values are printed and confusing as the reader might miss the first field. To fix this, add a newline before printing GstStructure fields in properties. NOTE: this does not change the existing inconsistent behavior of an extra newline *after* a GstStructure property, but the latter is not as annoying and it would take more effort to fix because GstStructure fields are printed in CAPS descriptions too.
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