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/LibPDF/Document.h

@@ -248,7 +248,7 @@ struct Formatter<PDF::OutlineDict> : Formatter<FormatString> {
         child_builder.append('[');
         for (auto& child : dict.children)
             child_builder.appendff("{}\n", child.to_string(2));
-        child_builder.append("  ]");
+        child_builder.append("  ]"sv);
 
         return Formatter<FormatString>::format(builder,
             "OutlineDict {{\n  count={}\n  children={}\n}}"sv, dict.count, child_builder.to_string());