Update glob for //:gnc cpp source to match PIO

Author: kylekrol

BUILD

@@ -7,7 +7,7 @@ load("@rules_cc//cc:defs.bzl", "cc_library")
 cc_library(
     name = "gnc",
     srcs = glob([
-        "src/gnc/**/*.hpp", "src/gnc/**/*.cpp", "src/gnc/**/*.inl",
+        "src/gnc/**/*.hpp", "src/gnc/*.cpp", "src/gnc/**/*.inl",
         "include/gnc/**/*.inl"
     ]),
     hdrs = glob([