Fix rust-analyzer for 16-bit fmt width and precision.

Author: m-ou-se

src/tools/rust-analyzer/crates/hir-def/src/hir/format_args.rs

@@ -137,7 +137,7 @@ pub enum FormatAlignment {
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum FormatCount {
     /// `{:5}` or `{:.5}`
-    Literal(usize),
+    Literal(u16),
     /// `{:.*}`, `{:.5$}`, or `{:a$}`, etc.
     Argument(FormatArgPosition),
 }