[Refactoring] Remove redundant qualifier names

[rkowase]

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In this PR, I removed the redundant qualifier names to fix lint warnings.

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[takahirom]

Please check the warning 🙏

> The following files had format violations:
See https://docs.gradle.org/7.5.1/userguide/command_line_interface.html#sec:command_line_warnings
      src/commonMain/kotlin/io/github/droidkaigi/confsched2022/strings/Strings.kt
98 actionable tasks: 7 executed, 46 from cache, 45 up-to-date
          @@ -1,6 +1,5 @@
           package·io.github.droidkaigi.confsched2022.strings
           
          -import·io.github.droidkaigi.confsched2022.model.Res
           import·io.github.droidkaigi.confsched2022.model.Res.strings
           
           public·val·Strings:·strings
  Run './gradlew :core:model:spotlessApply' to fix these violations.

[takahirom]

Thanks!