editor: focus relevant tab before unsaved changes prompt in fileOpen()

Tanish Kumarrequested to merge
tanishfr/lokalize:work/fix-fileopen-tab-focus into master

Revert All may show the unsaved-changes dialog from fileOpen() without focusing the related tab first. This change emits a small EditorTab signal before the prompt and wires it into LokalizeMainWindow to activate that tab, so the dialog appears with the right tab in view.

Edited by Finley Watson

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