[test][dxil-dis] Update metadata to match target triple

It's weird that we're specifying this in both the dxil and the LLVM IR
way, but if we are we should at least be consistent about it.

Author: bogner

llvm/test/tools/dxil-dis/opaque-value_as_metadata.ll

@@ -19,7 +19,7 @@ define void @main() {
 !0 = !{!"clang version 15.0.0"}
 !1 = !{i32 1, i32 0}
 !2 = !{i32 1, i32 7}
-!3 = !{!"ps", i32 6, i32 0}
+!3 = !{!"lib", i32 6, i32 7}
 !4 = !{null, null, !5, null}
 !5 = !{!6}
 ; CHECK-DAG:!{{[0-9]+}} = !{i32 0, %"$Globals"* @CBV