certify: get rid of fingerprint check

Master key ids are unambiguous by database design, and only keys which
are in the database are signed. There is no reason to check the
fingerprint again during the certify operation.

OpenKeychain/src/main/res/values/strings.xml

@@ -902,7 +902,6 @@
     <string name="msg_crt_error_master_not_found">"Master key not found!"</string>
     <string name="msg_crt_error_nothing">"No keys certified!"</string>
     <string name="msg_crt_error_unlock">"Error unlocking master key!"</string>
-    <string name="msg_crt_fp_mismatch">"Fingerprint mismatch, not certifying!"</string>
     <string name="msg_crt">"Certifying keyrings"</string>
     <string name="msg_crt_master_fetch">"Fetching certifying master key"</string>
     <string name="msg_crt_save">"Saving certified key %s"</string>