PLT-3237 Update displayed config values in admin console after saving (#3506)

* Reloaded admin console data when settings are saved

* Fixed attempting to save an invalid config setting overwriting the stored config

webapp/components/admin_console/image_settings.jsx

@@ -17,15 +17,6 @@ export default class ImageSettings extends AdminSettings {
         this.getConfigFromState = this.getConfigFromState.bind(this);
 
         this.renderSettings = this.renderSettings.bind(this);
-
-        this.state = Object.assign(this.state, {
-            thumbnailWidth: props.config.FileSettings.ThumbnailWidth,
-            thumbnailHeight: props.config.FileSettings.ThumbnailHeight,
-            profileWidth: props.config.FileSettings.ProfileWidth,
-            profileHeight: props.config.FileSettings.ProfileHeight,
-            previewWidth: props.config.FileSettings.PreviewWidth,
-            previewHeight: props.config.FileSettings.PreviewHeight
-        });
     }
 
     getConfigFromState(config) {
@@ -39,6 +30,17 @@ export default class ImageSettings extends AdminSettings {
         return config;
     }
 
+    getStateFromConfig(config) {
+        return {
+            thumbnailWidth: config.FileSettings.ThumbnailWidth,
+            thumbnailHeight: config.FileSettings.ThumbnailHeight,
+            profileWidth: config.FileSettings.ProfileWidth,
+            profileHeight: config.FileSettings.ProfileHeight,
+            previewWidth: config.FileSettings.PreviewWidth,
+            previewHeight: config.FileSettings.PreviewHeight
+        };
+    }
+
     renderTitle() {
         return (
             <h3>