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/LibGemini/GeminiRequest.cpp

@@ -14,7 +14,7 @@ ByteBuffer GeminiRequest::to_raw_request() const
 {
     StringBuilder builder;
     builder.append(m_url.to_string());
-    builder.append("\r\n");
+    builder.append("\r\n"sv);
     return builder.to_byte_buffer();
 }