[SYCL][E2E] Fix quote_path bug in lit config (#18218)

The quote_path bug does not only affecting
Windows(#18135) but also Linux. This
patch address this problem. This bug affects all usage of `quote_path`,
notably the `level_zero_dev_kit` feature.

```
zsh$> cat 1.py
import shlex
ret = shlex.quote('')
if ret:
    print("bug!")
else:
    print("not a problem")

zsh$> python3 1.py
bug!
```

Author: yingcong-wu

sycl/test-e2e/lit.cfg.py

@@ -250,8 +250,10 @@ def check_igc_tag_and_add_feature():
 
 
 def quote_path(path):
+    if not path:
+        return ""
     if platform.system() == "Windows":
-        return f'"{path}"' if path else ""
+        return f'"{path}"'
     return shlex.quote(path)
 
 # Call the function to perform the check and add the feature