Fix T47961: Wipe effects should have 2 inputs

source/blender/blenkernel/intern/seqeffects.c

@@ -1545,7 +1545,7 @@ static void init_wipe_effect(Sequence *seq)
 
 static int num_inputs_wipe(void)
 {
-	return 1;
+	return 2;
 }
 
 static void free_wipe_effect(Sequence *seq)

source/blender/makesrna/intern/rna_sequencer.c

@@ -2387,7 +2387,7 @@ static EffectInfo def_effects[] = {
 	{"TransformSequence", "Transform Sequence",
 	 "Sequence strip applying affine transformations to other strips", rna_def_transform, 1},
 	{"WipeSequence", "Wipe Sequence", "Sequence strip creating a wipe transition",
-	 rna_def_wipe, 1},
+	 rna_def_wipe, 2},
 	{"GaussianBlurSequence", "Gaussian Blur Sequence", "Sequence strip creating a gaussian blur",
 	 rna_def_gaussian_blur, 1},
 	{"TextSequence", "Text Sequence", "Sequence strip creating text",