Use builtin tilde expander on Tcl 8.6

No needs expand tildes by hand.

Author: qykth-git

gitk

@@ -12487,7 +12487,7 @@ proc tilde_expand {path} {
     if {$have_tk90} {
 	return [file tildeexpand $path]
     } else {
-	return [file normalize   $path]
+	return $path
     }
 }