Use .editorconfig to disable ktlint rule (#1844)

.editorconfig

@@ -2,3 +2,4 @@
 ij_kotlin_imports_layout = *
 ktlint_code_style = intellij_idea
 ktlint_function_naming_ignore_when_annotated_with = Composable
+ktlint_standard_class-signature = disabled

app/build.gradle.kts

@@ -310,7 +310,7 @@ spotless {
     kotlin {
         // https://github.com/diffplug/spotless/issues/111
         target("src/**/*.kt")
-        ktlint(ktlintVersion).editorConfigOverride(mapOf("ktlint_standard_class-signature" to "disabled"))
+        ktlint(ktlintVersion)
     }
     kotlinGradle {
         ktlint(ktlintVersion)