recipes: update for PYPI_PACKAGE change

The pypi class has slightly changed the semantics of the PYPI_PACKAGE
variable[1], now PYPI_PACKAGE is the normalised package name and the new
variable PYPI_PACKAGE_SDIST is used when the source tarball doesn't match.

Update recipes as appropriate: this is mostly deleting now-redundant
assignments but some assignments are still needed where packages are not
uploaded using the modern standards.

[1] oe-core 98049bf86b6 ("classes/pypi: change PYPI_PACKAGE to be normalised")

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-python/recipes-devtools/python/python3-flask-nav_0.6.bb

@@ -4,9 +4,10 @@ LIC_FILES_CHKSUM = "file://PKG-INFO;md5=2729ee82259d601d90d28b0574d12416"
 
 SRC_URI[sha256sum] = "44e40b755380a1e68ab521a2f9174de259a2c94ddcdaabf36b3aca2e110a33f4"
 
-
 inherit pypi setuptools3
 
+PYPI_PACKAGE_SDIST = "flask-nav"
+
 RDEPENDS:${PN} += "\
     python3-blinker \
     python3-flask \