Remove duplicate code (#4128)

Looks like some leftovers since we are conditionally doing the same
thing on the next line. I might be missing something though.

### Change type

- [ ] `bugfix`
- [x] `improvement`
- [ ] `feature`
- [ ] `api`
- [ ] `other`

### Release notes

- Remove some duplicate code which should make some of the exports a bit
smaller.

packages/tldraw/src/lib/shapes/note/NoteShapeUtil.tsx

@@ -237,7 +237,6 @@ export class NoteShapeUtil extends ShapeUtil<TLNoteShape> {
 	}
 
 	override toSvg(shape: TLNoteShape, ctx: SvgExportContext) {
-		ctx.addExportDef(getFontDefForExport(shape.props.font))
 		if (shape.props.text) ctx.addExportDef(getFontDefForExport(shape.props.font))
 		const theme = getDefaultColorTheme({ isDarkMode: ctx.isDarkMode })
 		const bounds = getBoundsForSVG(shape)

packages/tldraw/src/lib/shapes/text/TextShapeUtil.tsx

@@ -112,7 +112,6 @@ export class TextShapeUtil extends ShapeUtil<TLTextShape> {
 	}
 
 	override toSvg(shape: TLTextShape, ctx: SvgExportContext) {
-		ctx.addExportDef(getFontDefForExport(shape.props.font))
 		if (shape.props.text) ctx.addExportDef(getFontDefForExport(shape.props.font))
 
 		const bounds = this.editor.getShapeGeometry(shape).bounds