Add missing word

I'm guessing it was 'This'. That must've accidentally gotten selected when working with it.

Contributes to issue CURA-4341.

plugins/PluginBrowser/PluginBrowser.qml

@@ -217,7 +217,7 @@ UM.Dialog
                     anchors.top: parent.top
                     anchors.left: parent.left
                     anchors.right: parent.right
-                    text: licenseDialog.pluginName + catalog.i18nc("@label", " plugin contains a license.\nYou need to accept this license to install this plugin.\nDo you agree with the terms below?")
+                    text: licenseDialog.pluginName + catalog.i18nc("@label", "This plugin contains a license.\nYou need to accept this license to install this plugin.\nDo you agree with the terms below?")
                     wrapMode: Text.Wrap
                 }