Clear current line after upgrade.

Prevents the string "upgrade" from being appended to the next command typed.

Author: yasyf

config/commands.js

@@ -667,6 +667,7 @@ const commands = {
     await term.delayPrint("Please report any bugs you find.\r\n", 1 * timeUnit);
 
     term.prompt();
+    term.clearCurrentLine();
     term.locked = false;
   },