Pass absolute path to directoryExists

As pointed out by @gretzkiy, the `directoryExists` call added to
`matchFiles` in #44710 should have been passing the absolute path (since
the current directory might not match `currentDirectory`).

Author: amcasey

src/compiler/utilities.ts

@@ -6634,8 +6634,9 @@ namespace ts {
         const visited = new Map<string, true>();
         const toCanonical = createGetCanonicalFileName(useCaseSensitiveFileNames);
         for (const basePath of patterns.basePaths) {
-            if (directoryExists(basePath)) {
-                visitDirectory(basePath, combinePaths(currentDirectory, basePath), depth);
+            const absoluteBasePath = combinePaths(currentDirectory, basePath);
+            if (directoryExists(absoluteBasePath)) {
+                visitDirectory(basePath, absoluteBasePath, depth);
             }
         }