ir3: Use source in ir3_output_conv_src_type()
This was incorrectly converted when splitting the regs array. Noticed by inspection.
Fixes: d3e08327 ("ir3/core: Switch to srcs/dsts arrays")
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This was incorrectly converted when splitting the regs array. Noticed by inspection.
Fixes: d3e08327 ("ir3/core: Switch to srcs/dsts arrays")