Paywalls: don't dismiss footer paywalls automatically (#3683)

Follow up to #3517.

This behavior is the default and not opt-in, and it doesn't make sense
on footer paywalls.

RevenueCatUI/PaywallView.swift

@@ -329,7 +329,7 @@ struct LoadedOfferingPaywallView: View {
             .onAppear { self.purchaseHandler.trackPaywallImpression(self.createEventData()) }
             .onDisappear { self.purchaseHandler.trackPaywallClose() }
             .onChangeOf(self.purchaseHandler.purchased) { purchased in
-                if purchased {
+                if self.mode.isFullScreen, purchased {
                     Logger.debug(Strings.dismissing_paywall)
                     self.dismiss()
                 }