dev: fix Constants module resolution in tsc

This particular "prefix" is a file, not a directory, and this matters
for `tsc` (but not Webpack, which configures these in a different way).

assets/tsconfig.json

@@ -48,7 +48,7 @@
       "Components/*": ["components/*"],
       "Hooks/*": ["hooks/*"],
       "Util/*": ["util/*"],
-      "Constants/*": ["constants/*"]
+      "Constants": ["constants"],
     },                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
     // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
     // "typeRoots": [],                       /* List of folders to include type definitions from. */