UI: Forefast cheapest hour shown in forecast UI even with fixed grid tariff

[TobiasHuber1980]

Describe the bug

When using a fixed electricity tariff the forecast view shows a cheapest indicator (e.g. "Fri 12:15 – 13:15") together with the fixed price display. doesn´t make any sense 😄

Also displays "range 28.8 – 28.8 ct/kWh" and "average 28.8 ct/kWh" → redundant and misleading. simplify the price info to just show the constant price (e.g. "Fixed price: 28.8 ct/kWh").

Steps to reproduce

no need

Configuration details

grid:
  type: fixed
  price: 0.287563
feedin:
  type: fixed
  price: 0.076517

Log details

no need

What type of operating system or environment does evcc run on?

Linux

External automation

• I have made sure that no external automation like HomeAssistant or Node-RED is active or accessing any of the mentioned devices when this issue occurs.

Nightly build

• I have verified that the issue is reproducible with the latest nightly build

Version

0.300.8