smartlist: fix clear of search box not reseting filter

Change-Id: I8ad2600fb016347f8ecfce88af5232642ddcea12
Tuleap: #273
diff --git a/callwidget.cpp b/callwidget.cpp
index d5ea26f..db70b97 100644
--- a/callwidget.cpp
+++ b/callwidget.cpp
@@ -529,6 +529,7 @@
     time_t currentTime;
     ::time(&currentTime);
     cm->setLastUsed(currentTime);
+    ui->ringContactLineEdit->clear();
 }
 
 void
@@ -634,7 +635,7 @@
 }
 
 void
-CallWidget::on_ringContactLineEdit_textEdited(const QString& text)
+CallWidget::on_ringContactLineEdit_textChanged(const QString& text)
 {
     RecentModel::instance().peopleProxy()->setFilterWildcard(text);
 }