MOZILLA_PKIX_ERROR_REQUIRED_TLS_FEATURE_MISSING error message in WebGUI when using OCSP-must-staple SSL certificate

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### Prerequisites

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- [X] I am running the latest version
- [X] I checked the documentation and found no answer
- [X] I checked to make sure that this issue has not already been filed

### Issue Details

* **Version of AdGuard Home server:**
* v0.106.3
* **How did you install AdGuard Home:**
* `curl -s -S -L https://raw.githubusercontent.com/AdguardTeam/AdGuardHome/master/scripts/install.sh | sh -s -- -v`
* **How did you setup DNS configuration:**
* On a CentOS VPS.
* **CPU architecture:**
* AMD64
* **Operating system and version:**
* CentOS 7

### Expected Behavior
I run AdGuard Home on CentOS 7 VPS and has encryption enabled (DoH + DoT + DNS-over-QUIC). I use ZeroSSL certificate deployed by acme.sh script. If I use a certificate that has OCSP-must-staple extension issued using the commandline below:-

`acme.sh --issue --dns dns_cf --ocsp-must-staple --days 14 -k ec-256 -d domain-name-goes-here.tld ...`

I expect that everything will work OK where DoT/DoH/DNS-over-QUIC works and the WebGUI will be opened on SSL connection.

### Actual Behavior

But if I were to use a certificate issued via the command line above, DoT/DoH/DNS-over-QUIC still works OK when accessed from my Raspberry Pi that also has AdGuard Home installed. But if I want to open the WebGUI via Mozilla Firefox,the browser will spit out the error code: MOZILLA_PKIX_ERROR_REQUIRED_TLS_FEATURE_MISSING.

Other browsers like Microsoft Edge has no problem opening the WebGUI.

If I were to use a certificate without OCSP-must-staple extension issued using with the commandline below:-

`acme.sh --issue --dns dns_cf --days 14 -k ec-256 -d domain-name-goes-here.tld ...`

Everything works OK, and Mozilla Firefox can open the WebGUI.

This problem can also be mitigated if I were to set 'security.ssl.enable_ocsp_must_staple' to FALSE in Firefos's about:config.