revert: "fix: avoid an errant license warning banner on new deployments that d…" (#26240)

Reverts coder/coder#26239

We cannot disable a feature which was previously enabled; this is a BC
break.
This is also using `AIGatewayRoutingEnabled` which will be removed in
the next release.

codersdk/deployment.go

@@ -1805,7 +1805,7 @@ func (c *DeploymentValues) Options() serpent.OptionSet {
 		Flag:        "ai-gateway-enabled",
 		Env:         "CODER_AI_GATEWAY_ENABLED",
 		Value:       &c.AI.BridgeConfig.Enabled,
-		Default:     "false",
+		Default:     "true",
 		Group:       &deploymentGroupAIGateway,
 		YAML:        "enabled",
 	}
@@ -4191,7 +4191,7 @@ Write out the current server config as YAML to stdout.`,
 			Flag:        "aibridge-enabled",
 			Env:         "CODER_AIBRIDGE_ENABLED",
 			Value:       &c.AI.BridgeConfig.Enabled,
-			Default:     "false",
+			Default:     "true",
 			Group:       &deploymentGroupAIBridge,
 			YAML:        "enabled",
 			Hidden:      true,