refs #17725 [fid] refactor fid searchspecs.yaml for basic / demo instance

* remove obsolete Dismax fix from 14850 / 14831
* use finc as parent instead of vufind

fid/config/vufind/searchspecs.yaml

-'@parent_yaml':  ../../../config/vufind/searchspecs.yaml
-
-# Fixes unsupported "qt=edismax" query parameter setting.
+---
+"@parent_yaml": "../../../local/config/vufind/searchspecs.yaml"
\ No newline at end of file
-# Cf. https://projekte.ub.uni-leipzig.de/issues/14850#note-1.
-
-Author:
-  DismaxHandler: dismax
-
-ISN:
-  DismaxHandler: dismax
-
-Subject:
-  DismaxHandler: dismax
-
-Coordinate:
-  DismaxHandler: dismax
-
-JournalTitle:
-  DismaxHandler: dismax
-
-Title:
-  DismaxHandler: dismax
-
-Series:
-  DismaxHandler: dismax
-
-AllFields:
-  DismaxHandler: dismax
\ No newline at end of file