Fix use of encoder map in mechlovin/zed65/retro66 (#18158)

keyboards/mechlovin/zed65/retro66/keymaps/default/rules.mk

@@ -0,0 +1 @@
+ENCODER_MAP_ENABLE = yes

keyboards/mechlovin/zed65/retro66/keymaps/via/rules.mk

@@ -1,2 +1,3 @@
 VIA_ENABLE = yes
-LTO_ENABLE = yes
+LTO_ENABLE = yes
+ENCODER_MAP_ENABLE = yes

keyboards/mechlovin/zed65/retro66/rules.mk

@@ -1,2 +1 @@
 ENCODER_ENABLE = yes
-ENCODER_MAP_ENABLE = yes