Actually gorm:"type:text" was useless

With the Postgres backend, strings will use text by default.
Using varchar(255) by default (which is stupid) is done only for sqlite,
which doesn't care about the type anyways.

db.go

@@ -55,10 +55,10 @@ func InitDb() error {
 type DbAccountConfig struct {
 	gorm.Model
 
-	MxUserID string `gorm:"type:text;index"`
-	Name     string `gorm:"type:text"`
-	Protocol string `gorm:"type:text"`
-	Config   string `gorm:"type:text"`
+	MxUserID string `gorm:"index"`
+	Name     string
+	Protocol string
+	Config   string
 }
 
 // List of joined channels to be re-joined on reconnect
@@ -66,21 +66,21 @@ type DbJoinedRoom struct {
 	ID uint `gorm:"primary_key"`
 
 	// User id and account name
-	MxUserID    string `gorm:"type:text"`
-	Protocol    string `gorm:"type:text"`
-	AccountName string `gorm:"type:text"`
+	MxUserID    string
+	Protocol    string
+	AccountName string
 
 	// Room ID
-	RoomID connector.RoomID `gorm:"type:text"`
+	RoomID connector.RoomID
 }
 
 // User mapping between protocol user IDs and puppeted matrix ids
 type DbUserMap struct {
 	ID uint `gorm:"primary_key"`
 
-	Protocol string           `gorm:"type:text"`
-	UserID   connector.UserID `gorm:"type:text"`
-	MxUserID string           `gorm:"type:text;index"`
+	Protocol string
+	UserID   connector.UserID
+	MxUserID string `gorm:"index"`
 }
 
 // Room mapping between Matrix rooms and outside rooms
@@ -88,13 +88,13 @@ type DbRoomMap struct {
 	ID uint `gorm:"primary_key"`
 
 	// Network protocol
-	Protocol string `gorm:"type:text"`
+	Protocol string
 
 	// Room id on the bridged network
-	RoomID connector.RoomID `gorm:"type:text"`
+	RoomID connector.RoomID
 
 	// Bridged room matrix id
-	MxRoomID string `gorm:"type:text;index"`
+	MxRoomID string `gorm:"index"`
 }
 
 // Room mapping between Matrix rooms and private messages
@@ -102,21 +102,21 @@ type DbPmRoomMap struct {
 	ID uint `gorm:"primary_key"`
 
 	// User id and account name of the local end viewed on Matrix
-	MxUserID    string `gorm:"type:text"`
-	Protocol    string `gorm:"type:text"`
-	AccountName string `gorm:"type:text"`
+	MxUserID    string
+	Protocol    string
+	AccountName string
 
 	// User id to reach them
-	UserID connector.UserID `gorm:"type:text"`
+	UserID connector.UserID
 
 	// Bridged room for PMs
-	MxRoomID string `gorm:"type:text;index"`
+	MxRoomID string `gorm:"index"`
 }
 
 // Key-value store for various things
 type DbKv struct {
-	Key   string `gorm:"type:text;primary_key"`
-	Value string `gorm:"type:text"`
+	Key   string `gorm:"primary_key"`
+	Value string
 }
 
 // ---- Simple locking mechanism