[FS#512] uhttpd.init generates certificate with sha1 signature

[LEDE Bugs]

The following task has a new comment added:

FS#512 - uhttpd.init generates certificate with sha1 signature
User who did this - alive4ever (alive4ever)

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Only px5g-standalone is installed on this system, which only generates sha1-signed certificates and pulled by luci-ssl as default px5g backend.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=512#comment1856