Don't put the Enclave.config.xml file in git, since run_experiments creates it

Enclave/Enclave.config.xml

@@ -1,13 +0,0 @@
-<!-- Please refer to User's Guide for the explanation of each field -->
-<EnclaveConfiguration>
-  <ProdID>0</ProdID>
-  <ISVSVN>0</ISVSVN>
-  <StackMaxSize>0x40000</StackMaxSize>
-  <HeapMaxSize>0x244e9000</HeapMaxSize>
-  <TCSNum>32</TCSNum>
-  <TCSPolicy>1</TCSPolicy>
-  <DisableDebug>0</DisableDebug>
-  <MiscSelect>0</MiscSelect>
-  <MiscMask>0xFFFFFFFF</MiscMask>
-</EnclaveConfiguration>
-