configurejson2cmake: Fix compile tests without a "test" entry

Set the default value of the "test" entry to the test's name like the
qmake-based configure does.

Change-Id: Ic1027c54c6312c47dca241dd7e3dc65b3e35d36f
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

util/cmake/configurejson2cmake.py

@@ -527,7 +527,10 @@ def parseTest(ctx, test, data, cm_fh):
     if data["type"] == "compile":
         knownTests.add(test)
 
-        details = data["test"]
+        if "test" in data:
+            details = data["test"]
+        else:
+            details = test
 
         if isinstance(details, str):
             if not ctx["test_dir"]: