[LyX/master] remove bogus comment

[Jean-Marc Lasgouttes]

commit 3176ac365ce5bdb85c00d1afc36d7feac2438847
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Wed May 20 11:24:15 2015 +0200

    remove bogus comment
    
    There used to be a showCursor call below the command, sometimes between 
2002 and 2007.

diff --git a/src/Text3.cpp b/src/Text3.cpp
index ca74d9d..63e6a94 100644
--- a/src/Text3.cpp
+++ b/src/Text3.cpp
@@ -1075,8 +1075,6 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
                                        needsUpdate |= backspace(cur);
                                        cur.resetAnchor();
                                }
-                               // It is possible to make it a lot faster still
-                               // just comment out the line below...
                        }
                } else {
                        cutSelection(cur, true, false);