Fix Utils.minutesBetween()

minutesBetween(
    new Date(2019, 01, 01, 13, 20, 00), new Date(2019, 01, 01, 14, 20, 00)
)
returned 0 instead of 60, the fixed function property return numbers of
minutes after 60.

src/qml/utils.js

@@ -125,7 +125,7 @@ function thumbnailParametersFor(width, height) {
 
 
 function minutesBetween(date1, date2) {
-    return Math.round((((date2 - date1) % 86400000) % 3600000) / 60000)
+    return ((date2 - date1) / 1000) / 60
 }