bugfix: space characters are not allowed prior to DEX version 040

[gt4dev]

On command gradlew :library:assembleAndroidTest build crashes with error:

ERROR: C:\projects\kmp-templates\multiplatform-library-template\library\build\classes\kotlin\android\deviceTest\io\github\kotlin\fibonacci\FibiTest.class: D8: com.android.tools.r8.internal.ax: Space characters in SimpleName 'test 3rd element' are not allowed prior to DEX version 040
org.gradle.workers.WorkerExecutionException: There was a failure while executing work items
        at org.gradle.workers.internal.DefaultWorkerExecutor.workerExecutionException(DefaultWorkerExecutor.java:223)
        at org.gradle.workers.internal.DefaultWorkerExecutor.await(DefaultWorkerExecutor.java:205)
        at com.android.build.gradle.internal.tasks.DexArchiveBuilderTaskDelegate.doProcess(DexArchiveBuilderTaskDelegate.kt:215)
        at com.android.build.gradle.internal.tasks.DexArchiveBuilderTask.doTaskAction(DexArchiveBuilderTask.kt:225)
        at com.android.build.gradle.internal.tasks.NewIncrementalTask$taskAction$$inlined$recordTaskAction$1.invoke(BaseTask.kt:82)
        at com.android.build.gradle.internal.tasks.Blocks.recordSpan(Blocks.java:51)
...

Error is caused by spaces in fun 'test 3rd element' in commonTest.
I renamed it to fun test_3rd_element

Interesting that this function in folder androidTest had been already changed.
I renamed this function to fun test_3rd_element to keep consistent naming in both places androidTest, commonTest.

BTW1. Another solution for this problem would be to boost android-minSdk to API 30 from current 24.
But IMO it's weak solution as about 10% of Android devices still use API < 30.

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Related issue #62