Serve custom html file name without uri modifications

[DoubleCouponDay]

This allows a user to serve the development build folder without exporting a web build.

For Godot 3.5+ this folder is at: C:/Users/<username>/AppData/Local/Godot/web.
For Godot 4+ this folder at: C:/Users/<username>/Library/Caches/Godot/web.

Sample log output:

PS C:\Users\sjsui\AppData\Local\Godot\web> godot-https-server -f tmp_js_export.html
🚀 Server running at: https://localhost:8443
🔉 Audio mode control: https://localhost:8443?audio=worklet|legacy
TLS handshake failed: received fatal alert: CertificateUnknown
TLS handshake failed: received fatal alert: CertificateUnknown
TLS handshake failed: received fatal alert: CertificateUnknown
TLS handshake failed: received fatal alert: CertificateUnknown
Serving HTML file: tmp_js_export.html
Serving HTML file: tmp_js_export.html
Serving HTML file: tmp_js_export.html
Serving HTML file: tmp_js_export.html
Serving HTML file: tmp_js_export.html
TLS handshake failed: received fatal alert: CertificateUnknown
TLS handshake failed: received fatal alert: CertificateUnknown