Un-XFail CoreStore watchOS for master and swift-4.2-branch

Author: shahmishal

projects.json

@@ -382,17 +382,7 @@
         "workspace": "CoreStore.xcworkspace",
         "scheme": "CoreStore watchOS",
         "destination": "generic/platform=watchOS",
-        "configuration": "Release",
-        "xfail": {
-          "compatibility": {
-            "4.0": {
-              "branch": {
-                "master": "https://bugs.swift.org/browse/SR-7908",
-                "swift-4.2-branch": "https://bugs.swift.org/browse/SR-7908"
-              }
-            }
-          }
-        }
+        "configuration": "Release"
       },
       {
         "action": "BuildXcodeWorkspaceScheme",