Meta: Replace realpath usage with cross-platform function in WPT.sh

Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/d79fcceb8a6
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2031

Meta/WPT.sh

@@ -87,7 +87,7 @@ set_logging_flags()
     [ -n "${2}" ] || usage;
 
     log_type="${1}"
-    log_name="$(realpath "${2}")"
+    log_name="$(absolutize_path "${2}")"
 
     WPT_ARGS+=( "${log_type}=${log_name}" )
 }