Hide Selected Server in the Search tab when there is only the primary server connected

[Don-Isdale]

This sub-issue is part of #431.

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Introduction

This is related to issue 'Make the Datasources component less prominent because it is only used by advanced users ', and is easier to resolve :

In the Search tab there is 'Selected Server', and if there is only 1 datasource then this can be hidden, and when there are multiple datasources it can be displayed. The users who access multiple datasources are more advanced, and won't be confused by this display.

[Don-Isdale]

Changes implemented

b550d0d2 Hide Selected Server in the Search tab when there is only the primary server connected

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Tested OK on local