config: remove explicit setting of required property to its default value false

See #5551

backend/fichier/fichier.go

@@ -42,18 +42,15 @@ func init() {
 		}, {
 			Help:     "If you want to download a shared folder, add this parameter.",
 			Name:     "shared_folder",
-			Required: false,
 			Advanced: true,
 		}, {
 			Help:       "If you want to download a shared file that is password protected, add this parameter.",
 			Name:       "file_password",
-			Required:   false,
 			Advanced:   true,
 			IsPassword: true,
 		}, {
 			Help:       "If you want to list the files in a shared folder that is password protected, add this parameter.",
 			Name:       "folder_password",
-			Required:   false,
 			Advanced:   true,
 			IsPassword: true,
 		}, {

backend/hdfs/hdfs.go

@@ -24,7 +24,6 @@ func init() {
 		}, {
 			Name: "username",
 			Help: "Hadoop user name.",
-			Required: false,
 			Examples: []fs.OptionExample{{
 				Value: "root",
 				Help:  "Connect to hdfs as root.",
@@ -36,7 +35,6 @@ func init() {
 Enables KERBEROS authentication. Specifies the Service Principal Name
 (SERVICE/FQDN) for the namenode. E.g. \"hdfs/namenode.hadoop.docker\"
 for namenode running as service 'hdfs' with FQDN 'namenode.hadoop.docker'.`,
-			Required: false,
 			Advanced: true,
 		}, {
 			Name: "data_transfer_protection",
@@ -46,7 +44,6 @@ Specifies whether or not authentication, data signature integrity
 checks, and wire encryption is required when communicating the the
 datanodes. Possible values are 'authentication', 'integrity' and
 'privacy'. Used only with KERBEROS enabled.`,
-			Required: false,
 			Examples: []fs.OptionExample{{
 				Value: "privacy",
 				Help:  "Ensure authentication, integrity and encryption enabled.",

backend/koofr/koofr.go

@@ -39,7 +39,6 @@ func init() {
 		}, {
 			Name:     "mountid",
 			Help:     "Mount ID of the mount to use.\n\nIf omitted, the primary mount is used.",
-			Required: false,
 			Default:  "",
 			Advanced: true,
 		}, {

backend/tardigrade/fs.go

@@ -99,13 +99,11 @@ func init() {
 			{
 				Name:     "access_grant",
 				Help:     "Access grant.",
-				Required: false,
 				Provider: "existing",
 			},
 			{
 				Name:     "satellite_address",
 				Help:     "Satellite address.\n\nCustom satellite address should match the format: `<nodeid>@<address>:<port>`.",
-				Required: false,
 				Provider: newProvider,
 				Default:  "us-central-1.tardigrade.io",
 				Examples: []fs.OptionExample{{
@@ -123,13 +121,11 @@ func init() {
 			{
 				Name:     "api_key",
 				Help:     "API key.",
-				Required: false,
 				Provider: newProvider,
 			},
 			{
 				Name:     "passphrase",
 				Help:     "Encryption passphrase.\n\nTo access existing objects enter passphrase used for uploading.",
-				Required: false,
 				Provider: newProvider,
 			},
 		},