gstreamer: Be pedantic on srcpads access

Use the std::vector::back() instead of [0] index which corresponds
to std::vector::push_back() for tracking of pads. This doesn't
introduce a functional change as the gst_libcamera_src_init() will
only add one pad but it helps with readability.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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