fix(oauth): avoid overwriting user state when binding

oauth/linuxdo.go

@@ -184,6 +184,11 @@ func (p *LinuxDOProvider) GetProviderPrefix() string {
 	return "linuxdo_"
 }
 
+// ProviderUserIDColumn returns the users-table column storing this provider's user ID.
+func (p *LinuxDOProvider) ProviderUserIDColumn() string {
+	return "linux_do_id"
+}
+
 // TrustLevelError indicates the user's trust level is too low
 type TrustLevelError struct {
 	Required int