Check for incorrect cert type

src/freedombone-app-matrix

             if [[ $ONION_ONLY == "no" ]]; then
                 chmod 755 /etc/ssl/certs/${MATRIX_DOMAIN_NAME}.dhparam
             fi
+
+            if [ -f /etc/ssl/certs/${MATRIX_DOMAIN_NAME}.crt ]; then
+                echo $'Incorrect certificate generated'
+                exit 73572
+            fi
         fi
     fi