Tweak trade errors

[smk762]

closes: #2113
To test:

• Warning messages/tooltips for pro and simple mode should be the same
• zhtlc coins partially activated will display progress percentage
• error messages should make sense
• selecting a sell coin with zero balance shows placeholder and no spinning busy indicator visible
• sell coin volume input is disabled unless coin has balance and busy indicator not spinning

[SirSevenG]

lgtm

[Canialon]

There is no error about "..balance does not have enough funds to pay gas.."
like this(screenshot is from another branch):

Instead of it, the user can "start" swap but will get an error(this branch):

[smk762]

Thanks for the catch - BTC should not have anything to do with gas! I'll revisit the logic and see where it went wrong.

[smk762]

@Canialon should be fixed now

[SirSevenG]

On selecting coin with 0 balance in simple form as trade From, there're no error for it and infinite spinner on top of the form.

[13:14:48] [warning] [qt.trading.page.cpp:908] [4079]: last_trading_error is BalanceIsLessThanTheMinimalTradingAmount
[13:14:48] [info] [qt.orderbook.model.cpp:388] [4079]: full orderbook initialization initial size: 0 target size: 1, orderbook_kind: 1
[13:14:48] [info] [qt.orderbook.model.cpp:388] [4079]: full orderbook initialization initial size: 0 target size: 6, orderbook_kind: 2
[13:14:48] [info] [qt.orderbook.cpp:113] [4079]: selected best orders have a value - set preffered order
[13:14:48] [warning] [qt.trading.page.cpp:1473] [4079]: Spurious min_diff detected - (not) overriding immediately (using get_orderbook_wrapper()->get_current_min_taker_vol())

[smk762]

On selecting coin with 0 balance in simple form as trade From, there're no error for it and infinite spinner on top of the form.

[13:14:48] [warning] [qt.trading.page.cpp:908] [4079]: last_trading_error is BalanceIsLessThanTheMinimalTradingAmount
[13:14:48] [info] [qt.orderbook.model.cpp:388] [4079]: full orderbook initialization initial size: 0 target size: 1, orderbook_kind: 1
[13:14:48] [info] [qt.orderbook.model.cpp:388] [4079]: full orderbook initialization initial size: 0 target size: 6, orderbook_kind: 2
[13:14:48] [info] [qt.orderbook.cpp:113] [4079]: selected best orders have a value - set preffered order
[13:14:48] [warning] [qt.trading.page.cpp:1473] [4079]: Spurious min_diff detected - (not) overriding immediately (using get_orderbook_wrapper()->get_current_min_taker_vol())

Thanks for the feedback - should be fixed now.