All day event timezone fix (Sourcery refactored)

[sourcery-ai]

Pull Request #115 refactored by Sourcery.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it.

To incorporate these changes, you can either:

1. Merge this Pull Request instead of the original, or

2. Ask your contributor to locally incorporate these commits and push them to
   the original Pull Request

   Incorporate changes via command line

   git fetch https://github.com/PTST/O365-HomeAssistant pull/115/head
   git merge --ff-only FETCH_HEAD
   git push

NOTE: As code is pushed to the original Pull Request, Sourcery will
re-run and update (force-push) this Pull Request with new refactorings as
necessary. If Sourcery finds no refactorings at any point, this Pull Request
will be closed automatically.

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[sourcery-ai]

Function O365CalendarData.get_end_date refactored with the following changes:

• Lift return into if (lift-return-into-if)

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.90%.

Quality metrics	Before	After	Change
Complexity	2.28 ⭐	2.48 ⭐	0.20 👎
Method Length	53.00 ⭐	54.91 ⭐	1.91 👎
Working memory	9.40 🙂	9.51 🙂	0.11 👎
Quality	71.62% 🙂	70.72% 🙂	-0.90% 👎

Other metrics	Before	After	Change
Lines	304	310	6

Changed files	Quality Before	Quality After	Quality Change
custom_components/o365/calendar.py	71.62% 🙂	70.72% 🙂	-0.90% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
custom_components/o365/calendar.py	setup_platform	8 ⭐	160 😞	12 😞	50.41% 🙂	Try splitting into smaller methods. Extract out complex expressions
custom_components/o365/calendar.py	CalendarServices.respond_calendar_event	5 ⭐	136 😞	11 😞	57.61% 🙂	Try splitting into smaller methods. Extract out complex expressions
custom_components/o365/calendar.py	O365CalendarData.async_update	1 ⭐	110 🙂	15 😞	58.79% 🙂	Extract out complex expressions
custom_components/o365/calendar.py	O365CalendarData.async_get_events	4 ⭐	114 🙂	10 😞	63.16% 🙂	Extract out complex expressions
custom_components/o365/calendar.py	O365CalendarEventDevice.async_update	1 ⭐	98 🙂	12 😞	64.65% 🙂	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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