Never emit the fileMiddleClickActivated signal if isTabsForFilesEnabled is true

Commit d27ee07d makes it impossible for applications embedding Dolphin part (for example, Konqueror) to react to middle mouse click on a file. If I understand correctly (I'm not familiar with Dolphin code) the `fileMiddleClickActivated` signal is connected with a slot in `DolphinViewContainer`, which is only used by Dolphin itself and not by `DolphinPart`. The result is that middle clicking on a file (except archives) from a Dolphin part has no effect.

To avoid this situation, I removed the check for `!archiveProtocolIsEmpty()` in the `else if` condition. This way, if `isTabsForFilesEnabled()` is `true`, which should be true if and only if the view is inside a `DolphinPart`, the `activeTabRequested` or `tabRequested` signal will be emitted, allowing the embedding application to respond however it wants. When the view is inside the Dolphin application, instead, `isTabsForFilesEnabled()` will always be `false`, so the new behavior will be used.

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