config: remove explicit setting of required property to true for options with a default value

See #5551

backend/koofr/koofr.go

@@ -34,18 +34,15 @@ func init() {
 			Name:     "endpoint",
 			Help:     "The Koofr API endpoint to use.",
 			Default:  "https://app.koofr.net",
-			Required: true,
 			Advanced: true,
 		}, {
 			Name:     "mountid",
 			Help:     "Mount ID of the mount to use.\n\nIf omitted, the primary mount is used.",
-			Default:  "",
 			Advanced: true,
 		}, {
 			Name:     "setmtime",
 			Help:     "Does the backend support setting modification time.\n\nSet this to false if you use a mount ID that points to a Dropbox or Amazon Drive backend.",
 			Default:  true,
-			Required: true,
 			Advanced: true,
 		}, {
 			Name:     "user",

backend/tardigrade/fs.go

@@ -84,10 +84,9 @@ func init() {
 		},
 		Options: []fs.Option{
 			{
-				Name:     fs.ConfigProvider,
-				Help:     "Choose an authentication method.",
-				Required: true,
-				Default:  existingProvider,
+				Name:    fs.ConfigProvider,
+				Help:    "Choose an authentication method.",
+				Default: existingProvider,
 				Examples: []fs.OptionExample{{
 					Value: "existing",
 					Help:  "Use an existing access grant.",

backend/union/union.go

@@ -33,25 +33,21 @@ func init() {
 			Help:     "List of space separated upstreams.\n\nCan be 'upstreama:test/dir upstreamb:', '\"upstreama:test/space:ro dir\" upstreamb:', etc.",
 			Required: true,
 		}, {
-			Name:     "action_policy",
-			Help:     "Policy to choose upstream on ACTION category.",
-			Required: true,
-			Default:  "epall",
+			Name:    "action_policy",
+			Help:    "Policy to choose upstream on ACTION category.",
+			Default: "epall",
 		}, {
-			Name:     "create_policy",
-			Help:     "Policy to choose upstream on CREATE category.",
-			Required: true,
-			Default:  "epmfs",
+			Name:    "create_policy",
+			Help:    "Policy to choose upstream on CREATE category.",
+			Default: "epmfs",
 		}, {
-			Name:     "search_policy",
-			Help:     "Policy to choose upstream on SEARCH category.",
-			Required: true,
-			Default:  "ff",
+			Name:    "search_policy",
+			Help:    "Policy to choose upstream on SEARCH category.",
+			Default: "ff",
 		}, {
-			Name:     "cache_time",
-			Help:     "Cache time of usage and free space (in seconds).\n\nThis option is only useful when a path preserving policy is used.",
-			Required: true,
-			Default:  120,
+			Name:    "cache_time",
+			Help:    "Cache time of usage and free space (in seconds).\n\nThis option is only useful when a path preserving policy is used.",
+			Default: 120,
 		}},
 	}
 	fs.Register(fsi)