Fix clazy autoconnect slot name warnings

Author: nyalldawson

src/gui/qgssearchquerybuilder.cpp

@@ -254,7 +254,7 @@ long QgsSearchQueryBuilder::countRecords( const QString &searchString )
 }
 
 
-void QgsSearchQueryBuilder::on_btnOk_clicked()
+void QgsSearchQueryBuilder::btnOk_clicked()
 {
   // if user hits OK and there is no query, skip the validation
   if ( txtSQL->text().trimmed().length() > 0 )

src/gui/qgssearchquerybuilder.h

@@ -56,7 +56,7 @@ class GUI_EXPORT QgsSearchQueryBuilder : public QDialog, private Ui::QgsQueryBui
 
   private slots:
     void btnEqual_clicked();
-    void on_btnOk_clicked();
+    void btnOk_clicked();
     void btnLessThan_clicked();
     void btnGreaterThan_clicked();
     void btnLike_clicked();

src/providers/db2/qgsdb2newconnection.cpp

@@ -129,7 +129,7 @@ void QgsDb2NewConnection::btnConnect_clicked()
   testConnection();
 }
 
-void QgsDb2NewConnection::on_btnListDatabase_clicked()
+void QgsDb2NewConnection::btnListDatabase_clicked()
 {
   listDatabases();
 }

src/providers/db2/qgsdb2newconnection.h

@@ -42,7 +42,7 @@ class QgsDb2NewConnection : public QDialog, private Ui::QgsDb2NewConnectionBase
     void listDatabases();
   public slots:
     void accept() override;
-    void on_btnListDatabase_clicked();
+    void btnListDatabase_clicked();
     void btnConnect_clicked();
     void on_cb_trustedConnection_clicked();
   private: