tests: assume JSON monitor in qemuMonitorTestNewSimple

The only user of the qemuMonitorTestNewSimple macro is using JSON.
Always pass 'true' to qemuMonitorTestNew and remove the 'json'
argument.
Signed-off-by: NJán Tomko <jtomko@redhat.com>

tests/qemumonitortestutils.c

@@ -1318,7 +1318,7 @@ qemuMonitorTestNewFromFile(const char *fileName,
     if (virTestLoadFile(fileName, &json) < 0)
         goto cleanup;
 
-    if (simple && !(test = qemuMonitorTestNewSimple(true, xmlopt)))
+    if (simple && !(test = qemuMonitorTestNewSimple(xmlopt)))
         goto cleanup;
 
     /* Our JSON parser expects replies to be separated by a newline character.

tests/qemumonitortestutils.h

@@ -74,8 +74,8 @@ int qemuMonitorTestAddItemExpect(qemuMonitorTestPtr test,
                                  bool apostrophe,
                                  const char *response);
 
-# define qemuMonitorTestNewSimple(json, xmlopt) \
-    qemuMonitorTestNew(json, xmlopt, NULL, NULL, NULL, NULL)
+# define qemuMonitorTestNewSimple(xmlopt) \
+    qemuMonitorTestNew(true, xmlopt, NULL, NULL, NULL, NULL)
 # define qemuMonitorTestNewSchema(xmlopt, schema) \
     qemuMonitorTestNew(true, xmlopt, NULL, NULL, NULL, schema)