[fix] Avoid locator searches in current layer if it has been marked as not searchable

[gacarrillor]

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[3nids]

I'm not 100% sure here.
If we are on a specific layer and want to search in this one?
But this might be more coherent you are right.

[gacarrillor]

I'm not 100% sure here. If we are on a specific layer and want to search in this one? But this might be more coherent you are right.

@3nids, yeah, if layer features of a specific layer are to be searchable via QGIS locator, the layer's Searchable setting shouldn't be disabled.

This is to add consistency with e.g., Identifiable behavior, which when disabled, makes a layer impossible to identify even by setting the identify mode to Current Layer in the Identify Results panel.

Would it be OK for you if I point this PR to QGIS master?

[3nids]

Yes go ahead!