net-misc/dropbear: remove unused patch

Signed-off-by: Michael Mair-Keimberger <mm1ke@gentoo.org>

net-misc/dropbear/files/dropbear-2026.92-skip-failing-convert-test.patch

@@ -1,12 +0,0 @@
---- a/test/test_dropbearconvert.py
-+++ b/test/test_dropbearconvert.py
-@@ -28,6 +28,9 @@
- 	if kt == 'dss' and keyformat is None:
- 		pytest.skip("dss doesn't support openssh format")
- 
-+	if keytype == "ed25519" and keyformat == "PEM":
-+		pytest.skip("ssh-keygen does not support PEM format for type ed25519")
-+
- 	os_kt = kt
- 	if os_kt == 'dss':
- 		# OpenSSH calls it 'dsa', Dropbear calls it 'dss'