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/LibThreading/Thread.cpp

@@ -12,7 +12,7 @@
 Threading::Thread::Thread(Function<intptr_t()> action, StringView thread_name)
     : Core::Object(nullptr)
     , m_action(move(action))
-    , m_thread_name(thread_name.is_null() ? "" : thread_name)
+    , m_thread_name(thread_name.is_null() ? ""sv : thread_name)
 {
     register_property("thread_name", [&] { return JsonValue { m_thread_name }; });
     register_property("tid", [&] { return JsonValue { m_tid }; });