Changes to local BTC node reminder in Settings > Network info

[dmos62]

Under "Settings" > "Network info" we have a list of connected Bitcoin nodes. Under this list we provide a reminder in small font about Bisq being able to use a local Bitcoin node. This makes changes to that reminder:

1. the text is changed to be more accurate;
2. the condition under which the reminder used to be disabled is removed (because it doesn't seem to be necessary);
3. the formatting is slighty changed by dropping the parantheses: the paratheses serve to visually show that the reminder is background information, but that is already achieved by using small print.

Screenshot of reminder after change:

[sqrrm]

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