feat(web): add setting for minimum face count for face detection (#4128)

* feat: add setting for minimum face count for face detection

Adds the minimum face count setting to the web interface to
circumvent detection of strangers and random background people
if desired.

* fix: codestyle, remove max for face count

server/immich-openapi-specs.json

@@ -6471,6 +6471,9 @@
           "maxDistance": {
             "type": "integer"
           },
+          "minFaces": {
+            "type": "integer"
+          },
           "minScore": {
             "type": "integer"
           },
@@ -6484,6 +6487,7 @@
         "required": [
           "minScore",
           "maxDistance",
+          "minFaces",
           "enabled",
           "modelName"
         ],