fix: fix scroll custom import tokens (#16079)

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## **Description**

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## **Related issues**

Fixes: #15267 

## **Manual testing steps**

1. Go to import token page
2. go to custom import
3. click on select network then try to scroll

## **Screenshots/Recordings**

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### **Before**

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### **After**

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https://github.com/user-attachments/assets/441e7fd0-05eb-4f27-a3c3-6f7163f4cbd7



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Author: salimtb

app/components/Views/AddAsset/components/NetworkListBottomSheet.tsx

@@ -19,6 +19,7 @@ import {
 } from '../../../../component-library/components/Avatars/Avatar';
 import { Hex } from '@metamask/utils';
 import { getNetworkImageSource } from '../../../../util/networks';
+import BottomSheetHeader from '../../../../component-library/components/BottomSheets/BottomSheetHeader';
 
 export const NETWORK_LIST_BOTTOM_SHEET = 'NETWORK_LIST_BOTTOM_SHEET';
 
@@ -42,14 +43,17 @@ export default function NetworkListBottomSheet({
     <BottomSheet
       shouldNavigateBack={false}
       ref={sheetRef}
+      isInteractable={false}
       onClose={() => setOpenNetworkSelector(false)}
-      isInteractable
       style={styles.bottomSheetWrapperContent}
       testID={NETWORK_LIST_BOTTOM_SHEET}
     >
-      <Text variant={TextVariant.HeadingMD} style={styles.bottomSheetTitle}>
-        {strings('networks.select_network')}
-      </Text>
+      <BottomSheetHeader onClose={() => setOpenNetworkSelector(false)}>
+        <Text variant={TextVariant.HeadingMD} style={styles.bottomSheetTitle}>
+          {strings('networks.select_network')}
+        </Text>
+      </BottomSheetHeader>
+
       <ScrollView>
         {Object.values(networkConfigurations).map((network) => (
           <View style={styles.bottomSheetWrapper} key={network.chainId}>