move copypostfields to the pointer options; fix accidentally reverting part of test

ffi.bqn

@@ -62,7 +62,6 @@ curlOptions←{
 
   # long integer options
   postfieldsize⇐60  # size of the POST input data
-  copypostfields⇐10165 # copy POST input data
   timeout⇐78  # timeout in seconds
   timeoutms⇐155  # timeout in milliseconds
 
@@ -75,6 +74,7 @@ curlOptions←{
   writedata⇐ptrOffset+1  # FILE* in which to write response content
   postfields⇐ptrOffset+15  # pointer to POST input data
   headerdata⇐ptrOffset+29  # FILE* in which to write response headers
+  copypostfields⇐ptrOffset+165 # copy POST input data
 
   # linked list options
   httpHeader⇐slistOffset+23  # HTTP headers as a list of strings

tests.bqn

@@ -43,7 +43,7 @@ simpleAPI_testsuite←⟨
     ! 1=+´"Content-Type: "⍷r.headers
     ! 1=+´"Content-Length: "⍷r.headers
     ! 1=+´"""Content-Type"": ""application/json"""⍷r.content
-    ! 1=+´"""data"": ""{\""key\"": \""value\""}"""⍷r.content
+    ! 1=+´"""data"": ""{\""key\"": 1}"""⍷ r.content
   }
 ⟩