bug(Material 3 > Button): When button is last child element in mat-dialog-content it causes a vertical scrollbar to appear

### Is this a regression?

- [X] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

v17 (Material 2)

### Description

When button is last child element in mat-dialog-content it causes a vertical scrollbar to appear.

### Reproduction

StackBlitz [link](https://stackblitz.com/edit/stackblitz-starters-1giu8v?file=src%2Fapp%2Fdialog%2Fdialog.component.html)
Steps to reproduce:
1. Create Angular v18 project + add Angular material v18
2. Create a dialog component
3. In dialog component: Add a mat-button in mat-dialog-content
4. Open dialog


### Expected Behavior

There should be no vertical scrollbar in the dialog

### Actual Behavior

There is a vertical scroll bar in the dialog

### Environment

- Angular: "@angular/core": "18.0.0"
- CDK/Material: "@angular/material": "18.0.0"
- Browser(s): Edge
- Operating System: Windows

Angular CLI: 18.0.0
Node: 22.2.0
Package Manager: npm 10.7.0
OS: win32 x64

Angular: 18.0.0
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, language-service, material, material-luxon-adapter
... platform-browser, platform-browser-dynamic, platform-server
... router

Package Version
---------------------------------------------------------
@angular-devkit/architect 0.1800.0
@angular-devkit/build-angular 18.0.0
@angular-devkit/core 18.0.0
@angular-devkit/schematics 18.0.0
@schematics/angular 18.0.0
rxjs 7.8.1
typescript 5.4.5
zone.js 0.14.6

Inizia dalla riproduzione collegata su StackBlitz e verifica la barra di scorrimento in una finestra di dialogo Angular 18 Material contenente un pulsante come ultimo figlio di mat-dialog-content. Traccia gli stili di dialog-content e Material button coinvolti; il lavoro è completato quando la finestra di dialogo riprodotta non presenta una barra di scorrimento verticale indesiderata, mantenendo al contempo lo scorrimento previsto per il contenuto che eccede.

Scritto dal modello di indicizzazione a partire dal testo della issue.