Remove duplicate extension (#15)

Author: andreiavrammsd

.devcontainer/devcontainer.json

@@ -7,10 +7,9 @@
                 "ms-vscode.cmake-tools",
                 "ms-vscode.cpptools",
                 "ms-vscode.cpptools-extension-pack",
-                "xaver.clang-format",
-                "twxs.cmake",
                 "fredericbonnet.cmake-test-adapter",
-                "ms-vscode.cmake-tools",
+                "twxs.cmake",
+                "xaver.clang-format",
                 "AndreasNonslidHvardsen.clang-tidy-on-active-file",
                 "ryanluker.vscode-coverage-gutters",
                 "streetsidesoftware.code-spell-checker",