Big improvement in kcal accuracy (Fix 0 kcal)...

This will improve accuracy significantly, I'll put some examples:
Lets say kcal per min are 4 and time is 89s
 4 * (90 / 60) = 4 kcal
 (4 * 90) / 60 = 6 kcal
In big trains without much intervals that will be insignificant, but if we are talking about 12x90s intervals the difference is of 24 (72 - 48), which is a 50%! And if we increase interval's time, that percentage will be even higher
But it's even worse if we are talking about <60s intervals, because there kcal will be always 0:
4 * (59 / 60) = 0 kcal
(4 * 59) / 60 = 4 kcal
I just did a train and I exported to tcx and uploaded to strava, and there were just 7 kcal in ~15 mins, after looking the tcx, I found what I expected: just one of the intervals was >60s, and that one had 7 kcal, and all of the others had 0 kcal

Signed-off-by: Miguel <micrusa@hotmail.es>

app/src/main/java/me/micrusa/amaztimer/utils/latestTraining.java

@@ -54,15 +54,15 @@ void saveDataToFile(Context context, int time){
 
     public static int calculateKcal(int avgHr, int time, int age, int weight, boolean isMale){
         if(avgHr==0||time==0||age==0||weight==0){return 0;}
-        double kcal;
+        double kcalPerMin;
         //Formula from https://www.calculatorpro.com/calculator/calories-burned-by-heart-rate/
         if(isMale){
-            kcal = (-55.0969 + (0.6309 * avgHr) + (0.1988 * weight) + (0.2017 * age)) / 4.184;
+            kcalPerMin = (-55.0969 + (0.6309 * avgHr) + (0.1988 * weight) + (0.2017 * age)) / 4.184;
         }else{
-            kcal = (-20.4022 + (0.4472 * avgHr) + (0.1263 * weight) + (0.074) * age) / 4.184;
+            kcalPerMin = (-20.4022 + (0.4472 * avgHr) + (0.1263 * weight) + (0.074) * age) / 4.184;
         }
-        //Convert time to mins and then multiply by kcal/min
-        return (int) kcal * (time / 60);
+        //Calculate kcal from kcal/min
+        return (int) (kcalPerMin * time) / 60;
     }
 
     void cleanAllValues(Context context){