[LyX/master] Fix ru Beamer_Article polyglossia exports

[Scott Kostyshak]

commit 06855a66ca2a88a23749a6d9354b6062793301d8
Author: Scott Kostyshak <skostysh at lyx.org>
Date:   Sun Sep 13 01:27:19 2020 -0400

    Fix ru Beamer_Article polyglossia exports
    
    Set fonts to DejaVu to avoid the following error:
    
      ! Package polyglossia Error: The current latin font  does not
      contain the "Cyrillic" script!
    
    This choice of font is consistent with the Russian intro and
    tutorial manuals.
---
 .../Beamer_Article_%28Standard_Class%29.lyx        |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/examples/ru/Presentations/Beamer_Article_%28Standard_Class%29.lyx b/lib/examples/ru/Presentations/Beamer_Article_%28Standard_Class%29.lyx
index d2c5db4..d5fff81 100644
--- a/lib/examples/ru/Presentations/Beamer_Article_%28Standard_Class%29.lyx
+++ b/lib/examples/ru/Presentations/Beamer_Article_%28Standard_Class%29.lyx
@@ -11,9 +11,9 @@
 \language_package default
 \inputencoding utf8
 \fontencoding auto
-\font_roman "default" "default"
-\font_sans "default" "default"
-\font_typewriter "default" "default"
+\font_roman "default" "DejaVu Serif"
+\font_sans "default" "DejaVu Sans"
+\font_typewriter "default" "DejaVu Sans Mono"
 \font_math "auto" "auto"
 \font_default_family default
 \use_non_tex_fonts false