lsp: use project-name instead of crate_name to generate Cargo.toml path

My original patch was broken for crates with names-like-this, since it would incorrectly
add underscores instead of dashes to the pathname. This patch fixes the problem.

.vim/coc-settings.json

@@ -1,3 +1,3 @@
 {
-  "rust-analyzer.linkedProjects": ["Cargo.toml", "{{crate_name}}-ebpf/Cargo.toml"]
+  "rust-analyzer.linkedProjects": ["Cargo.toml", "{{project-name}}-ebpf/Cargo.toml"]
 }

.vscode/settings.json

@@ -1,3 +1,3 @@
 {
-  "rust-analyzer.linkedProjects": ["Cargo.toml", "{{crate_name}}-ebpf/Cargo.toml"]
+  "rust-analyzer.linkedProjects": ["Cargo.toml", "{{project-name}}-ebpf/Cargo.toml"]
 }