[Keyboard] Set OLED_DISPLAY_128X64 for Arch-36 (#12609)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/arch_36/config.h

@@ -55,4 +55,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                            11, 10,  9,  8,  7,  6 }
 #endif
 
+#define OLED_DISPLAY_128X64
+
 #define EE_HANDS