[LyX/master] Remove duplicated if clause

[Georg Baum]

commit 42362cfb87d1df08349e61b41347617fcd149925
Author: Georg Baum <b...@lyx.org>
Date:   Sun Jun 5 19:48:31 2016 +0200

    Remove duplicated if clause
    
    This was a thinko in 760b7cf2 (found by cppcheck), it was added in 977bbd9b 
as
    well.

diff --git a/src/insets/InsetLayout.cpp b/src/insets/InsetLayout.cpp
index 7291a60..a1677de 100644
--- a/src/insets/InsetLayout.cpp
+++ b/src/insets/InsetLayout.cpp
@@ -607,9 +607,6 @@ void InsetLayout::readArgument(Lexer & lex)
                } else if (tok == "insertcotext") {
                        lex.next();
                        arg.insertcotext = lex.getBool();
-               } else if (tok == "insertcotext") {
-                       lex.next();
-                       arg.insertcotext = lex.getBool();
                } else if (tok == "leftdelim") {
                        lex.next();
                        arg.ldelim = lex.getDocString();