Resolve "Section paramétrée - profil de section: option axes orthonormés"

Closes #497 (closed)

src/app/components/section-canvas/section-canvas.component.html

-<canvas #canvas [attr.width]="width" [attr.height]="height">
-</canvas>
+<div fxLayout="column" fxLayoutAlign="center center">
+    <canvas #canvas [attr.width]="width" [attr.height]="height">
+    </canvas>
+    <mat-checkbox [ngModel]="useRealAspectRatio" (ngModelChange)="setUseRealAspectRatio($event)">
+        {{ uitextUseRealRatio }}
+    </mat-checkbox>
+</div>
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