change typo from minetype to mimetype

Author: yingjin

src/app/core/shared/media-viewer-item.model.ts

@@ -17,7 +17,7 @@ export class MediaViewerItem {
   /**
    * Incoming Bitsream format mime type
    */
-  minetype: string;
+  mimetype: string;
 
   /**
    * Incoming Bitsream thumbnail

src/app/item-page/media-viewer/media-viewer-video/media-viewer-video.component.ts

@@ -45,7 +45,7 @@ export class MediaViewerVideoComponent implements OnInit {
     let filteredCapMedias: MediaViewerItem[];
     let capInfos: CaptionInfo[] = [];
     filteredCapMedias = this.medias
-       .filter((media) => media.minetype === 'text/vtt')
+       .filter((media) => media.mimetype === 'text/vtt')
        .filter((media) => media.bitstream.name.substring(0, (media.bitstream.name.length - 7) ).toLowerCase() === name.toLowerCase());
 
     if (filteredCapMedias) {

src/app/item-page/media-viewer/media-viewer.component.ts

@@ -108,7 +108,7 @@ export class MediaViewerComponent implements OnInit {
     const mediaItem = new MediaViewerItem();
     mediaItem.bitstream = original;
     mediaItem.format = format.mimetype.split('/')[0];
-    mediaItem.minetype = format.mimetype;
+    mediaItem.mimetype = format.mimetype;
     mediaItem.thumbnail = thumbnail ? thumbnail._links.content.href : null;
     return mediaItem;
   }