[LyX/master] Remove unnecessary friendship. Thanks Scott!

[Richard Kimberly Heck]

commit 491c96643685c731f27d8181fe40a42464d8f555
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sun Apr 26 03:16:44 2020 -0400

    Remove unnecessary friendship. Thanks Scott!
---
 src/ParagraphParameters.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/src/ParagraphParameters.h b/src/ParagraphParameters.h
index a57b433..ccb131c 100644
--- a/src/ParagraphParameters.h
+++ b/src/ParagraphParameters.h
@@ -39,8 +39,6 @@ public:
 	///
 	ParagraphParameters();
 	///
-	friend LyXErr & operator<<(LyXErr & os, ParagraphParameters const & cur);
-	///
 	void clear();
 	///
 	bool sameLayout(ParagraphParameters const &) const;