fix(SUP-42252): Actual view time for clips is not correct (#173)

Issue:
When playing only part of video by using the seekFrom the duration and currentTime is calculated according to the new times. so the position value (sent to analytics) is calculated from start time =0 (even that this is not 0 in the fully video).

Solution:
If seekFrom is defined, calculate the currentTime with the seekFrom value.

Solves SUP-42252

src/kava.ts

@@ -884,7 +884,11 @@ class Kava extends BasePlugin {
       }
       return 0;
     }
-    return this._isFirstPlaying ? this.player.currentTime! || this.player.sources.startTime || 0 : this.player.currentTime!;
+    let currentTime = this.player.currentTime;
+    if (typeof this.player.sources.seekFrom === 'number' && currentTime) {
+      currentTime += this.player.sources.seekFrom;
+    }
+    return this._isFirstPlaying ? currentTime! || this.player.sources.startTime || 0 : currentTime!;
   }
 
   private _getDeliveryType(): string {