TS: Remove redundant .getPoint() definitions on 3 curves.

src/extras/curves/CubicBezierCurve3.d.ts

@@ -10,6 +10,4 @@ export class CubicBezierCurve3 extends Curve<Vector3> {
 	v2: Vector3;
 	v3: Vector3;
 
-	getPoint( t: number ): Vector3;
-
 }

src/extras/curves/LineCurve3.d.ts

@@ -8,6 +8,4 @@ export class LineCurve3 extends Curve<Vector3> {
 	v1: Vector3;
 	v2: Vector3;
 
-	getPoint( t: number ): Vector3;
-
 }

src/extras/curves/QuadraticBezierCurve3.d.ts

@@ -9,6 +9,4 @@ export class QuadraticBezierCurve3 extends Curve<Vector3> {
 	v1: Vector3;
 	v2: Vector3;
 
-	getPoint( t: number ): Vector3;
-
 }