Remove spurious parameter from overviews dataviews functions

In the overviews-specialized dataview classes the sql-generating
functions had an unneeded parameter filters.
In some cases, since this parameter was not being paaased from
the base dataviews class it was masking the override parameter.

lib/cartodb/models/dataview/overviews/aggregation.js

@@ -65,7 +65,7 @@ Aggregation.prototype.constructor = Aggregation;
 
 module.exports = Aggregation;
 
-Aggregation.prototype.sql = function(psql, filters, override, callback) {
+Aggregation.prototype.sql = function(psql, override, callback) {
     if (!callback) {
         callback = override;
         override = {};

lib/cartodb/models/dataview/overviews/base.js

@@ -55,20 +55,20 @@ BaseOverviewsDataview.prototype.rewrittenQuery = function(query) {
 };
 
 // Default behaviour
-BaseOverviewsDataview.prototype.defaultSql = function(psql, filters, override, callback) {
+BaseOverviewsDataview.prototype.defaultSql = function(psql, override, callback) {
     var query = this.query;
     var dataview = this.baseDataview;
     if ( SETTINGS.defaultOverviews ) {
         query = this.rewrittenQuery(query);
         dataview = new this.BaseDataview(query, this.queryOptions);
     }
-    return dataview.sql(psql, filters, override, callback);
+    return dataview.sql(psql, override, callback);
 };
 
 // default implementation that can be override in derived classes:
 
-BaseOverviewsDataview.prototype.sql = function(psql, filters, override, callback) {
-    return this.defaultSql(psql, filters, override, callback);
+BaseOverviewsDataview.prototype.sql = function(psql, override, callback) {
+    return this.defaultSql(psql, override, callback);
 };
 
 BaseOverviewsDataview.prototype.search = function(psql, userQuery, callback) {

lib/cartodb/models/dataview/overviews/formula.js

@@ -36,7 +36,7 @@ Formula.prototype.constructor = Formula;
 
 module.exports = Formula;
 
-Formula.prototype.sql = function(psql, filters, override, callback) {
+Formula.prototype.sql = function(psql, override, callback) {
     var formulaQueryTpl = formulaQueryTpls[this.operation];
 
     if ( formulaQueryTpl ) {
@@ -52,5 +52,5 @@ Formula.prototype.sql = function(psql, filters, override, callback) {
     }
 
     // default behaviour
-    return this.defaultSql(psql, filters, override, callback);
+    return this.defaultSql(psql, override, callback);
 };