Fix interpolation.

python/ql/src/Security/CWE-377/InsecureTemporaryFile.ql

@@ -28,4 +28,4 @@ FunctionObject temporary_name_function(string mod, string function) {
 from Call c, string mod, string function
 where
     temporary_name_function(mod, function).getACall().getNode() = c
-select c, "Call to deprecated function $@.$@ may be insecure.", mod, function
+select c, "Call to deprecated function " + mod + "." + function + " may be insecure."

python/ql/test/query-tests/Security/CWE-377/InsecureTemporaryFile.expected

@@ -1,3 +1,3 @@
-| InsecureTemporaryFile.py:5:16:5:23 | mktemp() | Call to deprecated function $@.$@ may be insecure. | tempfile | mktemp |
-| InsecureTemporaryFile.py:11:16:11:27 | Attribute() | Call to deprecated function $@.$@ may be insecure. | os | tempnam |
-| InsecureTemporaryFile.py:17:16:17:26 | Attribute() | Call to deprecated function $@.$@ may be insecure. | os | tmpnam |
+| InsecureTemporaryFile.py:5:16:5:23 | mktemp() | Call to deprecated function tempfile.mktemp may be insecure. |
+| InsecureTemporaryFile.py:11:16:11:27 | Attribute() | Call to deprecated function os.tempnam may be insecure. |
+| InsecureTemporaryFile.py:17:16:17:26 | Attribute() | Call to deprecated function os.tmpnam may be insecure. |