Cursor (Windows): fixes Win8.1 support

Author: CarterLi

src/detection/cursor/cursor_windows.c

@@ -6,13 +6,12 @@
 void ffDetectCursor(FFCursorResult* result) {
     FF_AUTO_CLOSE_FD HANDLE hKey = NULL;
     if (ffRegOpenKeyForRead(HKEY_CURRENT_USER, L"Control Panel\\Cursors", &hKey, &result->error)) {
-        uint32_t cursorBaseSize;
-        if (ffRegReadValues(hKey, 2, (FFRegValueArg[]) {
-                                         FF_ARG(result->theme, NULL),
-                                         FF_ARG(cursorBaseSize, L"CursorBaseSize"),
-                                     },
-                &result->error)) {
-            ffStrbufAppendUInt(&result->size, cursorBaseSize);
+        if (ffRegReadStrbuf(hKey, NULL, &result->theme, &result->error)) {
+            uint32_t cursorBaseSize;
+            if (ffRegReadUint(hKey, L"CursorBaseSize", &cursorBaseSize, NULL)) {
+                // Not available on Windows 8.1
+                ffStrbufAppendUInt(&result->size, cursorBaseSize);
+            };
         }
     }
 }