Fix nested class in builder setter method (#12)

Author: junkfactory

src/main/java/com/github/junkfactory/innerbuilder/generators/BuilderMethodsGenerator.java

@@ -163,7 +163,7 @@ private PsiMethod generateBuilderSetter(PsiField field) {
                 .append(' ')
                 .append(fieldName)
                 .append('(')
-                .append(fieldType.getPresentableText())
+                .append(fieldType.getCanonicalText())
                 .append(' ')
                 .append(fieldName)
                 .append(") {")