Everywhere: Add sv suffix to strings relying on StringView(char const*)

Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).

No functional changes.

Userland/Libraries/LibWeb/CSS/Serialize.cpp

@@ -112,7 +112,7 @@ void serialize_a_url(StringBuilder& builder, StringView url)
 {
     // To serialize a URL means to create a string represented by "url(",
     // followed by the serialization of the URL as a string, followed by ")".
-    builder.append("url(");
+    builder.append("url("sv);
     serialize_a_string(builder, url.to_string());
     builder.append(')');
 }