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/checksum.cpp

@@ -43,7 +43,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.parse(arguments);
 
     if (paths.is_empty())
-        paths.append("-");
+        paths.append("-"sv);
 
     Crypto::Hash::Manager hash;
     hash.initialize(hash_kind);