Base: Remove "alias sd=SystemDialog" from /etc/shellrc

SystemDialog is no longer a standalone binary.

Base/etc/shellrc

@@ -14,7 +14,6 @@ alias he=HexEditor
 alias pp=PixelPaint
 alias qs=QuickShow
 alias pi=Piano
-alias sd=SystemDialog
 alias calc=Calculator
 alias calendar=Calendar
 alias ins=Inspector