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/DevTools/HackStudio/Debugger/VariablesModel.cpp

@@ -144,7 +144,7 @@ void VariablesModel::set_variable_value(const GUI::ModelIndex& index, StringView
     GUI::MessageBox::show(
         parent_window,
         String::formatted("String value \"{}\" could not be converted to a value of type {}.", string_value, variable->type_name),
-        "Set value failed",
+        "Set value failed"sv,
         GUI::MessageBox::Type::Error);
 }