[QA] Update needed in Web-UI is misleading

[jnweiger]

Seen while installing files_pdfviewer-0.12.0RC1 in docker owncloud/server:10.5 (and also docker owncloud/server:10.6.0)

The message is misleading. pdfviewer is not asking for an upgrade of 10.5.0 to a later core version -- it actually wants to
run database migrations, as installing files_pdfviewer-0.12.0 is actually an update from the shipped files_pdfviewer-0.11.0

Our docker images apparently ship with a config.php setting that not only prevent 'automatic' updates but also hides important information from the web UI.

In a manually installed 10.6 instance config.php is without the 'upgrade.disable-web' entry and we get the needed details:

Expected behaviour: 'upgrade.disable-web' => true only removes the 'Start Update' button, but leaves the text as is.

@iHerrmann77 thanks for spotting.

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