Editor webview: Wait for proxy only if there's a proxy configured

[daniele-verducci]

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI (N/A)

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	25	25
Correctness	52	52
Dodgy code	164	164
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	20	20
Performance	30	30
Security	16	16
Total	310	310

[github-actions]

📱 QA build

Download	app-qa-debug.apk
QR code	Open the QR code for this download
Commit	ff26a2b
Version	17815
Available until	7 days after this build

The QA build installs alongside a released Nextcloud app, so you can keep
using your existing install while testing.

Downloading the file requires a GitHub account, so open this link on the
device you want to test on, or transfer the APK to it.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../com/owncloud/android/ui/activity/EditorWebView.kt	0.00%	4 Missing ⚠️
...ain/java/com/owncloud/android/utils/WebViewUtil.kt	33.33%	1 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!