Don't highlight 'this' references as deprecated

#KT-17613 Fixed

compiler/testData/diagnostics/tests/deprecated/thisUsage.kt

@@ -0,0 +1,7 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+@Deprecated("Use A instead") open class MyClass {
+    fun foo() {
+        val test = this
+    }
+}

compiler/testData/diagnostics/tests/deprecated/thisUsage.txt

@@ -0,0 +1,9 @@
+package
+
+@kotlin.Deprecated(message = "Use A instead") public open class MyClass {
+    public constructor MyClass()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}