Use UTF8, MySQL 5.7 is the only docker image to use innodb default row format, but is broken and segfaults on many machines

data/conf/sogo/sogo.conf

@@ -1,6 +1,4 @@
 {
-	// Database configuration is written to GNUStep defaults when starting container.
-
     SOGoCalendarDefaultRoles = (
         PublicViewer,
         ConfidentialDAndTViewer,
@@ -11,9 +9,8 @@
     SOGoACLsSendEMailNotifications = YES;
     SOGoAppointmentSendEMailNotifications = YES;
     SOGoDraftsFolderName = "Drafts";
-	SOGoJunkFolderName= "Junk";
-	SOGoMailDomain = "sogo.local";
-    // Waiting for bug fix from SOGo
+    SOGoJunkFolderName= "Junk";
+    SOGoMailDomain = "sogo.local";
     SOGoEnableEMailAlarms = NO;
     SOGoFoldersSendEMailNotifications = YES;
     SOGoForwardEnabled = YES;
@@ -39,7 +36,6 @@
 
     SOGoMaximumSyncWindowSize = 0;
     SOGoMaximumSyncResponseSize = 1024;
-	MySQL4Encoding = "utf8mb4";
 
     WOWatchDogRequestTimeout = 10;
     WOListenQueueSize = 300;