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/Utilities/syscall.cpp

@@ -123,7 +123,7 @@ static FlatPtr as_buf(Vector<FlatPtr> params_vec)
 
     if constexpr (SYSCALL_1_DEBUG) {
         StringBuilder builder;
-        builder.append("Prepared [");
+        builder.append("Prepared ["sv);
         for (size_t i = 0; i < params_vec.size(); ++i) {
             builder.appendff(" {:p}", params_vec[i]);
         }