fix console_scripts format

Author: jph00

pyproject.toml

@@ -25,14 +25,10 @@ Documentation = "https://AnswerDotAI.github.io/execnb/"
 execnb = "execnb._modidx:d"
 
 [project.scripts]
-exec_nb=execnb.shell:exec_nb
-
+exec_nb = "execnb.shell:exec_nb"
 [tool.setuptools.dynamic]
 version = {attr = "execnb.__version__"}
 
-[project.scripts]
-exec_nb=execnb.shell:exec_nb
-
 [tool.setuptools.packages.find]
 include = ["execnb"]