Utilities/profile: Call split_view() using StringView for command parts

This fixes the always appearing 'No such file' error when using the -c
flag, as the String was deconstructed right after running this line.

Author: krkk

Userland/Utilities/profile.cpp

@@ -107,7 +107,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         return 0;
     }
 
-    auto cmd_parts = String(cmd_argument).split_view(' ');
+    auto cmd_parts = StringView(cmd_argument).split_view(' ');
 
     dbgln("Enabling profiling for PID {}", getpid());
     TRY(Core::System::profiling_enable(getpid(), event_mask));