fix: Add children props to Modal binding

Author: idl-tdeconinck

src/Paper__Appbar.re

@@ -63,4 +63,4 @@ module BackAction = {
     (~accessibilityLabel: string=?, ~onPress: 'a => unit, ~color: string=?) =>
     React.element =
     "BackAction";
-};
+};

src/Paper__Modal.re

@@ -1,5 +1,10 @@
 [@bs.module "react-native-paper"] [@react.component]
 external make:
-  (~dismissable: bool=?, ~visible: bool=?, ~onDismiss: unit => unit=?) =>
+  (
+    ~dismissable: bool=?,
+    ~visible: bool=?,
+    ~onDismiss: unit => unit=?,
+    ~children: React.element
+  ) =>
   React.element =
-  "Modal";
+  "Modal";