ocrd-tool.json: add model content-type, remove glob variant

ocrd_calamari/ocrd-tool.json

@@ -20,11 +20,11 @@
       "parameters": {
         "checkpoint_dir": {
           "description": "The directory containing calamari model files (*.ckpt.json). Uses all checkpoints in that directory",
-          "type": "string", "format": "file", "cacheable": true, "default": "qurator-gt4histocr-1.0"
+          "type": "string",
-        },
+          "format": "uri",
-        "checkpoint": {
+          "content-type": "text/directory",
-          "description": "The calamari model files (*.ckpt.json)",
+          "cacheable": true,
-          "type": "string", "format": "file", "cacheable": true
+          "default": "qurator-gt4histocr-1.0"
         },
         "voter": {
           "description": "The voting algorithm to use",