usdview --ff and --lf flags are broken (OpenUSD 25.08+)

[jufrantz]

Since OpenUSD v25.08, usdview fails to start when using --ff and/or --lf.

> usdview --ff 1 --lf 10 /path/to/some/file.usd
Traceback (most recent call last):
  File ".../bin/usdview", line 18, in <module>
    Usdviewq.Launcher().Run()
  File ".../lib/python/pxr/Usdviewq/__init__.py", line 79, in Run
    app, appController = self.LaunchPreamble(arg_parse_result)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../lib/python/pxr/Usdviewq/__init__.py", line 411, in LaunchPreamble
    appController = AppController(arg_parse_result, contextCreator)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../lib/python/pxr/Usdviewq/appController.py", line 561, in __init__
    self._resetSettings()
  File ".../lib/python/pxr/Usdviewq/appController.py", line 2465, in _resetSettings
    self._reloadFixedUI()
  File ".../lib/python/pxr/Usdviewq/appController.py", line 1342, in _reloadFixedUI
    self._dataModel.frameRangeBegin = self.realStartTimeCode
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../lib/python/pxr/Usdviewq/rootDataModel.py", line 117, in frameRangeBegin
    raise ValueError("Expected float, got: {}".format(value))
ValueError: Expected float, got: 1

This looks related to commit c66e6ba.

[jesschimein]

Filed as internal issue #USD-11763

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[spiffmon]

Thanks for the report, @jufrantz , and the indicated change looks like it. We'll have a look.