Revert "fix: prevent default object re-selection in relation field fo… (#17619)

I suggest to revert [this
PR](https://github.com/twentyhq/twenty/pull/17313) as it had already
been fixed [in this
PR](https://github.com/twentyhq/twenty/pull/17209/changes) (which fixes
more than it says in its title). Issue was tracked by [this
ticket](https://github.com/twentyhq/core-team-issues/issues/2049) not
very explicit - sorry, my fault.
Code added in the PR does not add value

packages/twenty-front/src/modules/settings/components/SettingsMorphRelationMultiSelect.tsx

@@ -1,5 +1,5 @@
 import styled from '@emotion/styled';
-import { plural, t } from '@lingui/core/macro';
+import { plural } from '@lingui/core/macro';
 import { useMemo, useRef, useState, type MouseEvent } from 'react';
 
 import { Dropdown } from '@/ui/layout/dropdown/components/Dropdown';
@@ -191,7 +191,6 @@ export const SettingsMorphRelationMultiSelect = ({
           isDisabled={isDisabled}
           selectSizeVariant={selectSizeVariant}
           hasRightElement={hasRightElement}
-          placeholderText={t`Select objects...`}
         />
       ) : (
         <Dropdown
@@ -214,7 +213,6 @@ export const SettingsMorphRelationMultiSelect = ({
               isDisabled={isDisabled}
               selectSizeVariant={selectSizeVariant}
               hasRightElement={hasRightElement}
-              placeholderText={t`Select objects...`}
             />
           }
           dropdownComponents={

packages/twenty-front/src/modules/settings/data-model/fields/forms/morph-relation/components/SettingsDataModelFieldRelationForm.tsx

@@ -17,7 +17,6 @@ import { SettingsTextInput } from '@/ui/input/components/SettingsTextInput';
 import { useIsMobile } from '@/ui/utilities/responsive/hooks/useIsMobile';
 import styled from '@emotion/styled';
 import { useLingui } from '@lingui/react/macro';
-import { useMemo } from 'react';
 import { isDefined } from 'twenty-shared/utils';
 import { RelationType } from '~/generated-metadata/graphql';
 
@@ -115,14 +114,10 @@ export const SettingsDataModelFieldRelationForm = ({
       relationType: initialRelationType,
     });
 
-  const initialMorphRelationsObjectMetadataIds = useMemo(
-    () =>
-      initialRelationObjectMetadataItems.map(
-        (relationObjectMetadataItem) => relationObjectMetadataItem.id,
-      ),
-    [initialRelationObjectMetadataItems],
-  );
-
+  const initialMorphRelationsObjectMetadataIds =
+    initialRelationObjectMetadataItems.map(
+      (relationObjectMetadataItem) => relationObjectMetadataItem.id,
+    );
   const isMobile = useIsMobile();
 
   return (