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/Services/FileOperation/main.cpp

@@ -263,7 +263,7 @@ ErrorOr<int> execute_work_items(Vector<WorkItem> const& items)
             outln("MKDIR {}", item.destination);
             // FIXME: Support deduplication like open_destination_file() when the directory already exists.
             if (mkdir(item.destination.characters(), 0755) < 0 && errno != EEXIST)
-                return Error::from_syscall("mkdir", -errno);
+                return Error::from_syscall("mkdir"sv, -errno);
             break;
         }