fix warning about unescaped control sequence

Signed-off-by: Nicholas Curtis <nicurtis@amd.com>

src/omniperf_base.py

@@ -76,8 +76,9 @@ class Omniperf:
         logging.info("Execution mode = %s" % self.__mode)
 
     def print_graphic(self):
-        """Log program name as ascii art to terminal."""
-        ascii_art = """
+        """Log program name as ascii art to terminal.
+        """
+        ascii_art = r"""
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