Fix inactive track color on mismatched themes

Before if your system theme was dark and your app
theme was set to light, the track colors were wrong.

Switch.tsx

@@ -27,6 +27,7 @@ export default function Switch({
         style={{marginRight: MARGIN}}
         value={value}
         onValueChange={onChange}
+        trackColor={{true: colors.primary + '80', false: colors.disabled}}
       />
       <Text>{children}</Text>
     </Pressable>