Misleading "Some files could not be synced!" #10053

• Launching the client with a single account configured with file provider only results in the "Some files could not be synced!" message in the tray window popover despite everything being fine.
• The problem is the lack of status information for which the app defaults to this message.
• Relevant code: syncstatussummary.cpp:251 where case SyncResult::Undefined: is handled.
• Force the file provider extension to report its (hopefully happy) state on launch to avoid the default undefined fallback with the misleading message.
• This is also reproducible when cleanly installing 34.0.0 release candidate 1 and setting up a fresh account with file provider which is the default. (this problem was noticed again in scope of Release 34.0.0-rc1 #10175)

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