[ObjCExport] Fix extensions interface name

KT-66315

native/objcexport-header-generator/testData/headers/extensionProperties/!extensionProperties.h

@@ -6,7 +6,7 @@
 #import <Foundation/NSString.h>
 #import <Foundation/NSValue.h>
 
-@class Foo;
+@class Clazz;
 
 NS_ASSUME_NONNULL_BEGIN
 #pragma clang diagnostic push
@@ -21,13 +21,13 @@ NS_ASSUME_NONNULL_BEGIN
 #endif
 
 __attribute__((objc_subclassing_restricted))
-@interface Foo : Base
+@interface Clazz : Base
 - (instancetype)init __attribute__((swift_name("init()"))) __attribute__((objc_designated_initializer));
 + (instancetype)new __attribute__((availability(swift, unavailable, message="use object initializers instead")));
 - (void)memberFun __attribute__((swift_name("memberFun()")));
 @end
 
-@interface Foo (Extensions)
+@interface Clazz (Extensions)
 @property (readonly) int32_t extensionValA __attribute__((swift_name("extensionValA")));
 @property (readonly) int32_t extensionValB __attribute__((swift_name("extensionValB")));
 @property int32_t extensionVarA __attribute__((swift_name("extensionVarA")));

native/objcexport-header-generator/testData/headers/extensionProperties/Foo.kt

@@ -1,18 +1,18 @@
 val topLevelPropA = 0
 val topLevelPropB = 1
 
-val Foo.extensionValA
+val Clazz.extensionValA
     get() = 0
-val Foo.extensionValB
+val Clazz.extensionValB
     get() = 1
 
-var Foo.extensionVarA
+var Clazz.extensionVarA
     get() = 0
     set(value) {}
-var Foo.extensionVarB
+var Clazz.extensionVarB
     get() = 1
     set(value) {}
 
-class Foo {
+class Clazz {
     fun memberFun() {}
 }