[Keyboard] Updated rules.mk for Sol to use the correct feature flag (#5672)

keyboards/sol/keymaps/default/rules.mk

@@ -19,7 +19,7 @@ UNICODE_ENABLE = no         # Unicode
 SWAP_HANDS_ENABLE = no      # Enable one-hand typing
 ENCODER_ENABLE_CUSTOM = yes # Enable rotary encoder (+90)
 
-OLED_ENABLE = no            # OLED_ENABLE (+5000)
+OLED_DRIVER_ENABLE = no     # Enable the OLED Driver (+5000)
 IOS_DEVICE_ENABLE = no      # Limit max brightness to connect to IOS device (iPad,iPhone)
 
 # Do not edit past here