Write LICENSE before SLOT in create_ebuild()

Better matches the order defined in skel.ebuild

A prerequisite for pkgcore/pkgcheck#645

src/pkgcore/pytest/plugin.py

@@ -263,14 +263,14 @@ def create_ebuild(self, cpvstr, data=None, **kwargs):
             f.write(f"EAPI={eapi}\n\n")
             f.write(f'DESCRIPTION="{desc}"\n')
             f.write(f'HOMEPAGE="{homepage}"\n')
-            f.write(f'SLOT="{slot}"\n')
-
             if license:
                 f.write(f'LICENSE="{license}"\n')
                 # create a fake license
                 os.makedirs(pjoin(self.path, "licenses"), exist_ok=True)
                 touch(pjoin(self.path, "licenses", license))
 
+            f.write(f'SLOT="{slot}"\n')
+
             for k, v in kwargs.items():
                 # handle sequences such as KEYWORDS and IUSE
                 if isinstance(v, (tuple, list)):