tests: Fix make testfile command

Author: kristijanhusak

Makefile

@@ -1,7 +1,7 @@
 test:
 	nvim --headless --clean -u tests/minimal_init.vim -c "TSUpdateSync org" -c "PlenaryBustedDirectory tests/plenary/ {minimal_init = 'tests/minimal_init.vim'}"
 testfile:
-	nvim --headless --clean -u tests/minimal_init.vim -c "TSUpdateSync org" -c "PlenaryBustedFile $(FILE)"
+	nvim --headless --clean -u tests/minimal_init.vim -c "TSUpdateSync org" -c "PlenaryBustedDirectory $(FILE) {minimal_init = 'tests/minimal_init.vim'}"
 docs:
 	md2vim -desc "*orgmode* *orgmode.nvim*\n* NOTE: This file is autogenerated from DOCS.md file" DOCS.md doc/orgmode.txt
 api_docs: