Use mathematical modulo implementation for calculations (#616)

See documentation (%/rem, mod) for differences.

Example for "issue" that occurred:
mathematical: -4 % 6 = 2 (expected)
kotlin: -4 % 6 = -4 (unexpected)

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/update/Updater.kt

@@ -75,7 +75,7 @@ class Updater : IUpdater {
 
         val updateInterval = serverConfig.globalUpdateInterval.hours.coerceAtLeast(6.hours).inWholeMilliseconds
         val lastAutomatedUpdate = preferences.getLong(lastAutomatedUpdateKey, 0)
-        val timeToNextExecution = updateInterval - (System.currentTimeMillis() - lastAutomatedUpdate) % updateInterval
+        val timeToNextExecution = (updateInterval - (System.currentTimeMillis() - lastAutomatedUpdate)).mod(updateInterval)
 
         val wasPreviousUpdateTriggered = System.currentTimeMillis() - (if (lastAutomatedUpdate > 0) lastAutomatedUpdate else System.currentTimeMillis()) < updateInterval
         if (!wasPreviousUpdateTriggered) {

server/src/main/kotlin/suwayomi/tachidesk/util/HAScheduler.kt

@@ -62,7 +62,7 @@ class HATask(id: String, val interval: Long, execute: () -> Unit, val timerTask:
 
     private fun getElapsedTimeOfCurrentInterval(): Long {
         val timeSinceFirstExecution = System.currentTimeMillis() - firstExecutionTime
-        return timeSinceFirstExecution % interval
+        return timeSinceFirstExecution.mod(interval)
     }
 
     override fun getLastExecutionTime(): Long {