fix: avoid clearing previous state when setting errors

Author: johanbook

src/index.ts

@@ -181,6 +181,7 @@ const useAJVForm = <T extends Record<string, any>>(
     setState((prevState) =>
       Object.keys(newErrors).reduce((updatedState, fieldName) => {
         return {
+          ...prevState,
           ...updatedState,
           [fieldName]: {
             ...prevState[fieldName],

src/useAjvForm.test.tsx

@@ -597,7 +597,17 @@ describe('useAJVForm should properly set errors programmatically using setErrors
       },
     };
 
-    const { result } = renderHook(() => useAJVForm(initialData, schema));
+    const { result } = renderHook(() =>
+      useAJVForm(
+        initialData,
+        schema,
+        {
+          userDefinedMessages: {
+            required: () => 'Monkey message',
+          },
+        },
+      ),
+    );
 
     result.current.setErrors([
       {