Fix ENERGY.Period after midnight

[gominoa]

ENERGY.Period incorrectly shows 0 for the first teleperiod after midnight

Description:

Below is a Grafana of ENERGY.Period with teleperiod of 60. The data is cleared at midnight, which results in Period incorrectly reporting 0 at the next teleperiod due to the if check in EnergyShow. Remove the if check because Energy.period is always valid with the revised calculation.

I've been running this patch for a couple weeks with no ill effects.

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on Tasmota core ESP8266 V.2.7.4.3
• The code change is tested and works on core ESP32 V.1.12.2
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass