adding style to fix viewport maximization (#349)

Packages-react/extensions/ohif-dicom-microscopy-extension/src/DicomMicroscopyViewport.js

@@ -73,7 +73,7 @@ class DicomMicroscopyViewport extends Component {
         {this.state.error ? (
           <h2>{JSON.stringify(this.state.error)}</h2>
         ) : (
-          <div ref={this.container} />
+          <div style={style} ref={this.container} />
         )}
       </div>
     );