.editorconfig: set trim_trailing_whitespace to false (#7958)

.editorconfig

@@ -5,7 +5,7 @@ indent_style = space
 indent_size = 2
 end_of_line = lf
 charset = utf-8
-trim_trailing_whitespace = true
+trim_trailing_whitespace = false
 insert_final_newline = true
 
 [*.py]