.editorconfig: Remove excess apostrophe at *.cocci

Remove the excess apostrophe (') introduced by commit
c4b471bd13.

Some editors complain about it.

Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>

.editorconfig

@@ -65,5 +65,5 @@ tab_width = 4
 [{*.bat,*.rc}]
 end_of_line = crlf
 
-[*.cocci]'
+[*.cocci]
 insert_final_newline = true