Fix use of encoder map in mechlovin/foundation (#18157)

keyboards/mechlovin/foundation/keymaps/default/rules.mk

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

keyboards/mechlovin/foundation/keymaps/via/rules.mk

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

keyboards/mechlovin/foundation/rules.mk

@@ -18,4 +18,3 @@ BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
 RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
 ENCODER_ENABLE = yes
 AUDIO_ENABLE = no           # Audio output
-ENCODER_MAP_ENABLE = yes