compiler testdata: s/trait/interface

compiler/testData/diagnostics/tests/resolve/specialConstructions/elvisAsCall.kt

@@ -1,6 +1,6 @@
 package a
 
-trait A
+interface A
 fun doList(l: List<Int>) = l
 fun doInt(i: Int) = i
 fun getList(): List<Int>? = null

compiler/testData/diagnostics/tests/resolve/specialConstructions/exclExclAsCall.kt

@@ -1,6 +1,6 @@
 package a
 
-trait A
+interface A
 
 fun <T>id(t: T): T = t
 fun doList(l: List<Int>) = l

compiler/testData/diagnostics/tests/resolve/specialConstructions/multipleSuperClasses.kt

@@ -1,11 +1,11 @@
 // !DIAGNOSTICS: -UNUSED_VARIABLE
 
-trait A
-trait B
+interface A
+interface B
 
-trait C: A, B
-trait D: A, B
-trait E: A, B
+interface C: A, B
+interface D: A, B
+interface E: A, B
 
 fun foo(c: C?, d: D?, e: E?) {
     val a: A? = <!TYPE_MISMATCH!>c ?: d<!> ?: e