fix drc errors (Sourcery refactored)

[sourcery-ai]

Pull Request #186 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

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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To manually merge these changes, make sure you're on the 119b branch, then run:

git fetch origin sourcery/119b
git merge --ff-only FETCH_HEAD
git reset HEAD^

Help us improve this pull request!

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.65%.

Quality metrics	Before	After	Change
Complexity	0.96 ⭐	0.87 ⭐	-0.09 👍
Method Length	75.24 🙂	79.38 🙂	4.14 👎
Working memory	7.97 🙂	8.17 🙂	0.20 👎
Quality	69.71% 🙂	69.06% 🙂	-0.65% 👎

Other metrics	Before	After	Change
Lines	424	417	-7

Changed files	Quality Before	Quality After	Quality Change
tests/test_components.py	93.71% ⭐	93.75% ⭐	0.04% 👍
ubcpdk/tech.py	64.90% 🙂	64.62% 🙂	-0.28% 👎
ubcpdk/samples/write_mask.py	85.41% ⭐	82.69% ⭐	-2.72% 👎

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
ubcpdk/tech.py	get_layer_stack	0 ⭐	217 ⛔	13 😞	52.00% 🙂	Try splitting into smaller methods. Extract out complex expressions
ubcpdk/tech.py	add_pins_bbox_siepic	4 ⭐	108 🙂	16 ⛔	54.95% 🙂	Extract out complex expressions
ubcpdk/tech.py	add_pins_siepic	1 ⭐	50 ⭐	10 😞	75.49% ⭐	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

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

---

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Help us improve this quality report!

[sourcery-ai]

Lines 13-13 refactored with the following changes:

• Remove duplicate keys when instantiating sets (remove-duplicate-set-key)

[sourcery-ai]

Function add_labels_to_ports_optical refactored with the following changes:

• Replace if statement with if expression (assign-if-exp)

[sourcery-ai]

Lines 38-39 refactored with the following changes:

• Remove redundant conditional (remove-redundant-if)