Add input for number of input files

Necessary since commit 6e52178b.

Convert_Matlab/Tests/short_tests.json

@@ -13,7 +13,8 @@
 		"N_eddies.mat"
 	    ],
 	    "$src_dir/Convert_Matlab/Tests/Eurec4A_OA/date_num.mat"
-	]
+	],
+	"input": "1\n"
     },
     {
 	"title": "Graph_from_Matlab_v6_anti",
@@ -29,7 +30,8 @@
 		"N_eddies.mat"
 	    ],
 	    "$src_dir/Convert_Matlab/Tests/Eurec4A_OA/date_num.mat"
-	]
+	],
+	"input": "1\n"
     },
     {
 	"title": "Mat_HDF5_to_shapefiles",