Allow :file parameter in org-ql dynamic blocks

Author: yantar92

org-ql-search.el

@@ -271,13 +271,14 @@ Valid parameters include:
 For example, an org-ql dynamic block header could look like:
 
   #+BEGIN: org-ql :query (todo \"UNDERWAY\") :columns (priority todo heading) :sort (priority date) :ts-format \"%Y-%m-%d %H:%M\""
-  (-let* (((&plist :query :columns :sort :ts-format :take) params)
+  (-let* (((&plist :query :columns :sort :ts-format :take :file) params)
           (query (cl-etypecase query
                    (string (org-ql--query-string-to-sexp query))
                    (list  ;; SAFETY: Query is in sexp form: ask for confirmation, because it could contain arbitrary code.
                     (org-ql--ask-unsafe-query query)
                     query)))
           (columns (or columns '(heading todo (priority "P"))))
+          (file (or file (current-buffer)))
           ;; MAYBE: Custom column functions.
           (format-fns
            ;; NOTE: Backquoting this alist prevents the lambdas from seeing
@@ -299,7 +300,7 @@ For example, an org-ql dynamic block header could look like:
                                       (ts-format ts-format (ts-parse-org-element it)))))
                  (cons 'property (lambda (element property)
                                    (org-element-property (intern (concat ":" (upcase property))) element)))))
-          (elements (org-ql-query :from (current-buffer)
+          (elements (org-ql-query :from file
                                   :where query
                                   :select '(org-element-headline-parser (line-end-position))
                                   :order-by sort)))