ScriptCompleter: use default completion mode

Using UnfilteredPopupCompletion produces a (very) long list of choices, rather than limiting choices to selected prefix.

Author: zas

picard/ui/widgets/scripttextedit.py

@@ -175,7 +175,6 @@ def highlightBlock(self, text):
 class ScriptCompleter(QCompleter):
     def __init__(self, parent=None):
         super().__init__(self.choices, parent)
-        self.setCompletionMode(QCompleter.CompletionMode.UnfilteredPopupCompletion)
         self.last_selected = ''
         self.highlighted.connect(self.set_highlighted)