removing source-type

Unnecessary

snap/snapcraft.yaml

@@ -46,7 +46,6 @@ parts:
   one:
     plugin: make
     source: .
-    source-type: git
     build-packages:
       - build-essential
       - libc++-dev
@@ -67,4 +66,4 @@ slots:
   zerotier-control:
     interface: content
     read:
-      - $SNAP_COMMON
+      - $SNAP_COMMON