add missing 0 in band name when needed

[vincentsarago]

band definition between satellite is different. For Landsat it can be B1 while for Sentinel2 it should be B01. I think we can ease the task for the user and accept apply some magic within the _get_band_url method

rio-tiler-pds/rio_tiler_pds/sentinel/aws/sentinel2.py

Lines 92 to 94 in c1bd8b1

	def _get_band_url(self, band: str) -> str:
	"""Validate band name and return band's url."""
	if band not in self.bands:

cc @kylebarron