Fix various template warnings (#32)

- Missing :
- Deprecated =
- Not valid color name
- Must always return statement

data/magic-m15-meld-3in1.mse-style/style

@@ -644,7 +644,7 @@ card style:
 			name: Beleren Bold
 			size: {if styling.three_cards == "yes" then 8 else 16 }
 			color: black
-			separator color: red	
+			separator color: red
 	pt 2:
 		z index: 2
 		left: 143
@@ -928,7 +928,7 @@ extra card field:
 	editable: true
 	save value: true
 	description: The image of the card
-extra card field
+extra card field:
 	type: choice
 	name: change focus
 	choice: