Psi2ir: do not generate init block body in kapt mode

plugins/kapt3/kapt3-compiler/testData/converter/anonymousInitializer.kt

@@ -0,0 +1,7 @@
+class C {
+    fun f() {}
+
+    init {
+        f()
+    }
+}

plugins/kapt3/kapt3-compiler/testData/converter/anonymousInitializer.txt

@@ -0,0 +1,12 @@
+import java.lang.System;
+
+@kotlin.Metadata()
+public final class C {
+
+    public C() {
+        super();
+    }
+
+    public final void f() {
+    }
+}