There are some issues for collecting stats of Scala code

[zhengjiudan]

Describe the bug
I could see two items for each Scala class in the HTMP report. One is correct and another is not.

Desktop (please complete the following information):

• OS: [e.g. Linux]
• Gradle version: [e.g. 7.5.1]
• Diff Coverage plugin version [e.g. 0.9.5]

To Reproduce
If possible, provide your configuration of the plugin, for example:

diffCoverageReport {
    diffSource.file = 'diff.patch'

    violationRules.failIfCoverageLessThan 0.9
}

Expected behavior
A clear and concise description of what you expected to happen.

Logs
If applicable, add stacktrace, Gradle output.

Additional context
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