Fix paths

Replaced backslashes in paths with slashes. I did
not touch function that do the same with paths.
Those can be removed manually.
Also dataDir() returns a path that ends with a
slash so I got rid of duplicated slashes.

.vscode/settings.json

@@ -1,3 +1,3 @@
 {
-  "rust-analyzer.linkedProjects": [".\\src-tauri\\Cargo.toml"]
+  "rust-analyzer.linkedProjects": ["src-tauri/Cargo.toml"]
 }