Fix tests

Author: Gerrit Garbereder

Task-Tracker-Entities/src/commonTest/kotlin/com/garbereder/tasktracker/entities/ActivityNotFoundExceptionTests.kt

@@ -8,7 +8,7 @@ class ActivityNotFoundExceptionTests {
     @Test
     fun testMessage() {
         val task = Task("TaskName")
-        val duration = 60
+        val duration = 60L
         val activity = Activity(duration, task)
         val ex = ActivityNotFoundException(activity)
         assertEquals("Could not find activity: Activity(durationInSeconds=$duration, task=$task)", ex.message)