Set Qt.ImhNoPredictiveText for text field that acts as a search field

This ensures that searching happens while the text is being entered from
a virtual keyboard.

CCBUG: 439914
(cherry picked from commit 7166eb4c)

applet/contents/ui/Toolbar.qml

@@ -149,6 +149,8 @@ ColumnLayout {
 
             Layout.fillWidth: true
 
+            inputMethodHints: Qt.ImhNoPredictiveText
+
             focus: true
             clearButtonShown: true
             placeholderText: i18nc("text field placeholder text", "Search…")