[LyX/master] Revert "By default, use an argument's menu string as its label string."

[Richard Kimberly Heck]

commit 65d0c96855e0f27c65f6539b2a8c1629e6f7f7ab
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Fri Mar 26 13:58:28 2021 -0400

    Revert "By default, use an argument's menu string as its label string."
    
    Committed by accident.
    
    This reverts commit affd6101bddb3afebad05e16f36e771c04b7b8e3.
---
 src/insets/InsetLayout.cpp |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/src/insets/InsetLayout.cpp b/src/insets/InsetLayout.cpp
index 00e63b8..b6056cd 100644
--- a/src/insets/InsetLayout.cpp
+++ b/src/insets/InsetLayout.cpp
@@ -770,8 +770,6 @@ void InsetLayout::readArgument(Lexer & lex)
 		} else if (tok == "menustring") {
 			lex.next();
 			arg.menustring = lex.getDocString();
-			if (arg.labelstring.empty())
-				arg.labelstring = arg.menustring;
 		} else if (tok == "mandatory") {
 			lex.next();
 			arg.mandatory = lex.getBool();