[RISCVInsertVSETVLI] Default to VL=1 for scalar extracts
We were defaulting to VL=0 when we didn't otherwise have a vsetv nearby. Instead, let's use VL=1. VL=0 is very much a cornercase in hardware, and let's avoid if we can. Differential Revision: https://reviews.llvm.org/D158015
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