Make bandit to ignore B311 for id_from_image_name transform (#1657)

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### Summary
Make bandit to ignore B311 for id_from_image_name transform
--> Re-located the comment, # nosec B311)
The result of bandit-scan is pasted:
```
Run started:2024-10-24 06:29:43.187490

Test results:
        No issues identified.

Code scanned:
        Total lines of code: 51857
        Total lines skipped (#nosec): 6
        Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 12

Run metrics:
        Total issues (by severity):
                Undefined: 0
                Low: 0
                Medium: 0
                High: 0
        Total issues (by confidence):
                Undefined: 0
                Low: 0
                Medium: 0
                High: 0
Files skipped (0):
```
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src/datumaro/plugins/transforms.py

@@ -662,8 +662,8 @@ def _add_unique_suffix(self, name):
         count = 0
         while name in self._names:
             suffix = "".join(
-                random.choices(self.SUFFIX_LETTERS, k=self._suffix_length)
-            )  # nosec B311
+                random.choices(self.SUFFIX_LETTERS, k=self._suffix_length)  # nosec B311
+            )
             new_name = f"{name}__{suffix}"
             if new_name not in self._names:
                 name = new_name