fix(in-app-browser): fix mandatory options (#2684)

fix(in-app-browser): fix mandatory options

src/@ionic-native/plugins/in-app-browser/index.ts

@@ -30,15 +30,15 @@ export interface InAppBrowserOptions {
   mediaPlaybackRequiresUserAction?: 'yes' | 'no';
   /** (Android) Set to yes to hide the navigation buttons on the location toolbar, only has effect if user has location set to yes. The default value is no. 
    *  (iOS) Set to yes or no to turn the toolbar navigation buttons on or off (defaults to no). Only applicable if toolbar is not disabled.*/
-  hidenavigationbuttons: 'yes' | 'no';
+  hidenavigationbuttons?: 'yes' | 'no';
   /** (Android) Set to yes to hide the url bar on the location toolbar, only has effect if user has location set to yes. The default value is no.*/
-  hideurlbar: 'yes' | 'no';
+  hideurlbar?: 'yes' | 'no';
   /** (Android) Set to a valid hex color string, for example: #00ff00, and it will change the color of both navigation buttons from default. Only has effect if user has location set to yes and not hidenavigationbuttons set to yes.
    *  (iOS) Set as a valid hex color string, for example: #00ff00, to change from the default color. Only applicable if navigation buttons are visible. */
-  navigationbuttoncolor: string;
+  navigationbuttoncolor?: string;
   /** (Android) Set to a valid hex color string, for example: #00ff00, and it will change the color the toolbar from default. Only has effect if user has location set to yes. 
    *  (iOS) Set as a valid hex color string, for example: #00ff00, to change from the default color of the toolbar. Only applicable if toolbar is not disabled.*/
-  toolbarcolor: string;
+  toolbarcolor?: string;
   /** (Android Only) Set to yes to make InAppBrowser WebView to pause/resume with the app to stop background audio (this may be required to avoid Google Play issues) */
   shouldPauseOnSuspend?: 'yes' | 'no';
   /** (Android Only) Set to yes to show a close button in the footer similar to the iOS Done button. The close button will appear the same as for the header hence use closebuttoncaption and closebuttoncolor to set its properties */
@@ -50,7 +50,7 @@ export interface InAppBrowserOptions {
   /** (iOS Only) Set to yes or no to turn the toolbar on or off for the InAppBrowser (defaults to yes) */
   toolbar?: 'yes' | 'no';
   /** (iOS Only) Set to yes or no to make the toolbar translucent(semi-transparent) (defaults to yes). Only applicable if toolbar is not disabled. */
-  toolbartranslucent: 'yes' | 'no';
+  toolbartranslucent?: 'yes' | 'no';
   /** (iOS Only)  Set to yes or no to prevent viewport scaling through a meta tag (defaults to no). */
   enableViewportScale?: 'yes' | 'no';
   /** (iOS Only) Set to yes or no to allow in-line HTML5 media playback, displaying within the browser window rather than a device-specific playback interface.
@@ -72,7 +72,7 @@ export interface InAppBrowserOptions {
    * Please note that if location=no is also specified, there will be no control presented to user to close IAB window. */
   fullscreen?: 'yes';
   /** (Android Only) Sets whether the WebView should enable support for the "viewport" HTML meta tag or should use a wide viewport. When the value of the setting is no, the layout width is always set to the width of the WebView control in device-independent (CSS) pixels. When the value is yes and the page contains the viewport meta tag, the value of the width specified in the tag is used. If the page does not contain the tag or does not provide a width, then a wide viewport will be used. (defaults to yes). */
-  useWideViewPort: 'yes' | 'no';
+  useWideViewPort?: 'yes' | 'no';
   /**
    * @hidden
    */