Tests: Allow wpt.live URLs for both “WPT.sh run” and “WPT.sh import”

This change allows you to give http[s]://wpt.live/ URLs to the WPT.sh
script for both the “WPT.sh run” and “WPT.sh import” commands.

That facilitates the use case where you’ve navigated to a wpt.live URL
in a browser, and you want to just directly copy-paste the URL in order
to either run the test in Ladybird, or import the test into the repo.

Otherwise, without this change, when using WPT.sh, you’re limited to
needing to specify either a WPT path fragment or filesystem pathname —
which doesn’t allow for easy copy-paste directly from wpt.fyi.

Meta/WPT.sh

@@ -131,6 +131,8 @@ for i in "${!TEST_LIST[@]}"; do
     item="${TEST_LIST[i]}"
     item="${item#"$WPT_SOURCE_DIR"/}"
     item="${item#*Tests/LibWeb/WPT/wpt/}"
+    item="${item#http://wpt.live/}"
+    item="${item#https://wpt.live/}"
     TEST_LIST[i]="$item"
 done
 
@@ -193,6 +195,12 @@ serve_wpt()
 
 import_wpt()
 {
+    for i in "${!INPUT_PATHS[@]}"; do
+        item="${INPUT_PATHS[i]}"
+        item="${item#http://wpt.live/}"
+        item="${item#https://wpt.live/}"
+        INPUT_PATHS[i]="$item"
+    done
     pushd "${LADYBIRD_SOURCE_DIR}" > /dev/null
         ./Meta/ladybird.sh build headless-browser
         for path in "${INPUT_PATHS[@]}"; do