Fix pytype error highlights for 1-line errors that doesn't have an end_line

[copybara-service]

Fix pytype error highlights for 1-line errors that doesn't have an end_line

Before the fix, a python-compiler-error could be printed as:

type Point = tuple[float, float]~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
type Point = tuple[float, float]

Now, it will be correctly printed to:

type Point = tuple[float, float]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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