`check_fonts()` download to `CONFIG_DIR` fix (#7489)

Follows https://github.com/ultralytics/yolov5/pull/7488. Correct bug where fonts were downloading to current working directory rather than global CONFIG_DIR

utils/general.py

@@ -427,10 +427,11 @@ def check_file(file, suffix=''):
 def check_font(font=FONT, progress=False):
     # Download font to CONFIG_DIR if necessary
     font = Path(font)
-    if not font.exists() and not (CONFIG_DIR / font.name).exists():
+    file = CONFIG_DIR / font.name
+    if not font.exists() and not file.exists():
         url = "https://ultralytics.com/assets/" + font.name
-        LOGGER.info(f'Downloading {url} to {CONFIG_DIR / font.name}...')
-        torch.hub.download_url_to_file(url, str(font), progress=progress)
+        LOGGER.info(f'Downloading {url} to {file}...')
+        torch.hub.download_url_to_file(url, str(file), progress=progress)
 
 
 def check_dataset(data, autodownload=True):