Update learn.json

Author: rosinni

learn.json

@@ -5,7 +5,7 @@
 	    "es": "Problemas de Calculo y Algebra con Python"
 	},
 	"slug" : "calculus-and-algebra-problems-with-python",
-	"preview": "https://github.com/breatheco-de/calculus-and-algebra-problems-with-python/blob/main/preview.jpeg?raw=true",
+	"preview": "https://github.com/4GeeksAcademy/calculus-and-algebra-problems-with-python/blob/main/preview.jpeg",
 	"solution": "https://github.com/breatheco-de/calculus-and-algebra-problems-with-python/blob/main/solutions.ipynb",
 	"status": "published",
 	"translations": ["es", "us"],