drop broken pinning mechanism

OpenKeychain/src/main/assets/LetsEncryptCA.cer

@@ -1,27 +0,0 @@
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------END CERTIFICATE-----

OpenKeychain/src/main/assets/hkps.pool.sks-keyservers.net.CA.cer

@@ -1,32 +0,0 @@
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OpenKeychain/src/main/assets/pgp.mit.edu.cer

@@ -1,32 +0,0 @@
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----