[LyX/master] LyXHTML: don't explicitly mention that the style is CSS, HTML5 doesn't like it.

[Thibaut Cuvelier]

commit fb4a26577e9f1149e78bd500447ce061445bd708
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Sat Jan 7 03:42:11 2023 +0100

    LyXHTML: don't explicitly mention that the style is CSS, HTML5 doesn't like it.
---
 src/Buffer.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 1404cd4..3f66864 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -2316,7 +2316,7 @@ Buffer::ExportStatus Buffer::writeLyXHTMLSource(odocstream & os,
 			// we are here if the CSS is supposed to be written to the header
 			// or if we failed to write it to an external file.
 			if (!written) {
-				os << "<style type='text/css'>\n"
+				os << "<style>\n"
 					 << dstyles
 					 << "\n</style>\n";
 			}