Do not print newline after every command

This newline is already ommitted from batch files and noecho commands,
this change makes the behaviour consistent in interactive mode.

Additional newline is a behaviour inherited from MS-DOS, and even still
visible in Windows cmd.exe, but all modern DOS implementations,
PowerShell, unix terminals, etc - they all prefer consistent behaviour
over addtional newline. Also, there's no point in wasting 4% of screen
estate just to show empty line.

This fixes CLS command, which is now able to properly clean the screen
and place prompt in the first line.

src/shell/shell.cpp

@@ -358,7 +358,6 @@ void DOS_Shell::Run(void) {
 			if (echo) ShowPrompt();
 			InputCommand(input_line);
 			ParseLine(input_line);
-			if (echo && !bf) WriteOut_NoParsing("\n");
 		}
 	} while (!exit);
 }