[Keyboard] Correct name of community layout for ortho75 (#6434)

keyboards/cannonkeys/ortho75/rules.mk

@@ -54,4 +54,4 @@ BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 ENCODER_ENABLE = yes
 
-LAYOUTS = LAYOUT_ortho_5x15
+LAYOUTS = ortho_5x15