Cleanup: apply redundant string template inspection

compiler/tests/org/jetbrains/kotlin/code/ModulesDependenciesTest.kt

@@ -55,7 +55,7 @@ class ModulesDependenciesTest : TestCase() {
 
         TestCase.assertTrue("Number of modules have dependencies to module $COMPILER_TESTS_MODULE_NAME. Such dependencies can cause multiple " +
                             "tests execution on teamcity when running configuration with 'Search tests across module dependencies' enabled:\n" +
-                            "${badModulesList.joinToString(separator = "\n")}",
+                            badModulesList.joinToString(separator = "\n"),
                             badModulesList.isEmpty())
     }
 

compiler/tests/org/jetbrains/kotlin/jvm/compiler/AbstractWriteSignatureTest.kt

@@ -249,7 +249,7 @@ abstract class AbstractWriteSignatureTest : TestCaseWithTmpdir() {
     companion object {
         fun formatSignature(header: String, jvmSignature: String?, genericSignature: String): String {
             return listOf(
-                    "$header",
+                    header,
                     jvmSignature?.let { "jvm signature: $it" },
                     "generic signature: $genericSignature"
             ).filterNotNull().joinToString("\n") { "// $it" }