remove unused patch file

Found with "fedpkg unused-patches"

Make-webtest-an-optional-dependency.patch

@@ -1,36 +0,0 @@
-From 903d77cb73bd6713279f1d9920f5f665293a26c2 Mon Sep 17 00:00:00 2001
-From: Robbie Harwood <rharwood@redhat.com>
-Date: Thu, 9 Aug 2018 14:57:56 -0400
-Subject: [PATCH] Make webtest an optional dependency
-
-Resolves: #38
-(cherry picked from commit c0bee88c60deb176d420d90447d24c370d70727a)
----
- tests.py | 7 ++++++-
- 1 file changed, 6 insertions(+), 1 deletion(-)
-
-diff --git a/tests.py b/tests.py
-index 992529f..c2b1fc0 100644
---- a/tests.py
-+++ b/tests.py
-@@ -33,7 +33,11 @@ from dns.rdataclass import IN as RDCLASS_IN
- from dns.rdatatype import SRV as RDTYPE_SRV
- from dns.rdtypes.IN.SRV import SRV
- 
--from webtest import TestApp as WebTestApp
-+try:
-+    from webtest import TestApp as WebTestApp
-+except ImportError:
-+    print("webtest not installed!  Tests will be skipped")
-+    WebTestApp = "skip"
- 
- import kdcproxy
- from kdcproxy import codec
-@@ -45,6 +49,7 @@ HERE = os.path.dirname(os.path.abspath(__file__))
- KRB5_CONFIG = os.path.join(HERE, 'tests.krb5.conf')
- 
- 
-+@unittest.skipIf(WebTestApp == "skip", "webtest not installed")
- class KDCProxyWSGITests(unittest.TestCase):
-     addrinfo = [
-         (2, 1, 6, '', ('128.66.0.2', 88)),