The @alanz repo fails to clone, use digital-assets

N.B. The below git error when doing a submodule init or recursive clone
with the alanz repo as the submodule.

```
error: Server does not allow request for unadvertised object 956e11d
Fetched in submodule path 'ghcide', but it did not contain 956e11d. D
irect fetching of that commit failed.
```

Author: Thomas M. DuBuisson

.gitmodules

@@ -1,4 +1,3 @@
 [submodule "ghcide"]
 	path = ghcide
-	# url = https://github.com/digital-asset/ghcide.git
-	url = https://github.com/alanz/ghcide.git
+	url = https://github.com/digital-asset/ghcide.git