Enables trailing comma editor config

Author: ericdecanini

.editorconfig

@@ -770,7 +770,7 @@ ij_kotlin_align_multiline_extends_list = false
 ij_kotlin_align_multiline_method_parentheses = false
 ij_kotlin_align_multiline_parameters = true
 ij_kotlin_align_multiline_parameters_in_calls = false
-ij_kotlin_allow_trailing_comma = false
+ij_kotlin_allow_trailing_comma = true
 ij_kotlin_allow_trailing_comma_on_call_site = false
 ij_kotlin_assignment_wrap = off
 ij_kotlin_blank_lines_after_class_header = 0