[tsmeta] Fixup parsing for (> 1) instance of '://' in URIs.

Reference:

"layer": "meta-oe",
"recipe": "recipes-support/onig/onig_5.9.6.bb"
"src_uri": [
    "https://web.archive.org/web/20150807014439/http://www.geocities.jp/kosako3/oniguruma/archive/onig-5.9.6.tar.gz",
    ...
]

classes/tsmeta.bbclass

@@ -289,7 +289,7 @@ def tsmeta_get_src(d):
     for uri_desc in src_dict["src_uri"]:
         uri_uri = uri_desc.split(";")[0]
 
-        (uri_type, uri_spec) = uri_desc.split("://")
+        (uri_type, uri_spec) = uri_desc.split("://", 1)
         uri_path = uri_spec.split(";")[0]
 
         if is_patch(uri_spec):