Add missing f-prefix to format string

Author: kastiglione

lldb/test/API/lang/swift/exception_breakpoint_recognizer/TestSwiftExceptionBreakpointRecognizer.py

@@ -12,7 +12,7 @@ def test(self):
         bp = target.BreakpointCreateForException(lldb.eLanguageTypeSwift, False, True)
 
         log_file = self.getBuildArtifact("symbol.log")
-        self.runCmd("log enable lldb symbol -f {log_file}")
+        self.runCmd(f"log enable lldb symbol -f {log_file}")
 
         # First breakpoint in an untyped throws function.
         _, process, _, _ = lldbutil.run_to_breakpoint_do_run(self, target, bp)