reset for subtracted seconds

src/components/timer.vue

@@ -104,6 +104,7 @@
 			reset(event){
 				this.savedPreviousSeconds = 0;
 				this.totalSeconds = 0;
+				this.secondsToSubtract = 0;
 			},
 			setSecondsManually(){
 				this.totalSeconds = this.manualHours*60*60 + this.manualMinutes*60 + this.manualSeconds;