Changed dialog header size to reflect new input fields and dropdowns, dialog buttons line height and padding changed to reflect those changes as well.
Changed dialog header size to reflect new input fields and dropdowns, dialog buttons line height and padding changed to reflect those changes as well.

jupyter/jupyterlab,eskirk/jupyterlab,charnpreetsingh185/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,charnpreetsingh185/jupyterlab,eskirk/jupyterlab,charnpreetsingh185/jupyterlab,eskirk/jupyterlab,charnpreetsingh185/jupyterlab,jupyter/jupyterlab,jupyter/jupyterlab,charnpreetsingh185/jupyterlab,eskirk/jupyterlab,eskirk/jupyterlab