[gnome-chess] Fix another 'static const' warning

[Michael Catanzaro <mcatanzaro src gnome org>]

commit f6ae4b6d6b5cd0eb8f96c6017fcfcf7bee2c4191
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Mar 11 11:41:51 2017 -0600

    Fix another 'static const' warning

 src/gnome-chess.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index 09a0ff0..a68861d 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -96,7 +96,7 @@ Copyright © 2015–2016 Sahil Sareen""";
         { PAUSE_RESUME_ACTION_NAME, pause_resume_cb },
     };
 
-    private static const OptionEntry[] option_entries =
+    private const OptionEntry[] option_entries =
     {
         { "version", 'v', 0, OptionArg.NONE, null,
         /* Help string for command line --version flag */