How to update the records with a button in salesforce lightning

Apex class

==========

public class AccountController

{

    @AuraEnabled

    public static Account getAccountData(String AccountId){

        Account acc= [select Id,Name,Site from Account where Id=:AccountId];

        return acc;

    }

    @AuraEnabled

    public static Account updateSite(Account acc){

        acc.site='Approved by brahmanaidu as per the comments';

try{

update acc;

}

catch(Exception e){

throw new auraHandledException('unable to update the record due to'+e.getMessage());

}

        return acc;

    } 

}

component

=========

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global"

                            controller="AccountController" >

    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>

    <aura:attribute name="account" type="Account" default="{'sobjectType':'Account'}"/>

    <lightning:button label="Approve"  onclick="{!c.updateStatus}"/>

 </aura:component>   

controller

==========

({

   doInit : function(component, event, helper)

   {

        var action = component.get("c.getAccountData");

        action.setParams({

AccountId:component.get("v.recordId")

           

        });

        action.setCallback(this, function(response){

    var state=response.getState();

if(state==='SUCCESS'){

component.set("v.account",response.getReturnValue());

}

else if(state==='ERROR'){

var error=response.getError();

console.log('Error in fetching the data'+error[0].message);

}

        });

        $A.enqueueAction(action);

    },

    updateStatus:function(component,event,helper)

    {

        var action=component.get('c.updateSite');

        action.setParams({

           acc:component.get("v.account")

        });

        action.setCallback(this,function(response){

var state=response.getState();

if(state==='SUCCESS'){

component.set("v.account",response.getReturnValue());

$A.get('e.force:refreshView').fire();

var dismissActionPanel = $A.get("e.force:closeQuickAction");

dismissActionPanel.fire();

}

else if(state==='ERROR'){

var error=response.getError();

console.log('Error in updating the data'+error[0].message);

}

        });

        

        $A.enqueueAction(action);

    }

})