Fix jvmTarget & ktlint config in kotlin flag preset

[ks-yim]

Motivation:

• Currently, compiling kotlin source with line-gradle-scripts emits the following warning if javaTargetCompatibility is >= 11. Maybe we should make this option pick up the value from javaTargetCompatibility property.

  > Task :come:module:compileKotlin
  'compileJava' task (current target is 11) and 'compileKotlin' task (current target is 1.8) jvm target compatibility should be set to the same Java version.

• ktlint exclude("/gen-src/") filter condition doesn't work for dynamically attached source and it should be modified to...:

  filter {
      exclude { it.file.path.contains("gen-src/")
  }

  • See: https://github.com/JLLeitschuh/ktlint-gradle#faq
• line-gradle-scripts is currently using a old ktlint version(0.36.0) due to [ktlint 0.37.0] New indentation rule issues  pinterest/ktlint#764, but it seems the issue has been resolved in a newer linter version.