Remove backslash from build commands

Author: shaoltan-amazon

.github/workflows/examples-linux-tv-casting-app.yaml

@@ -60,7 +60,7 @@ jobs:
                   #   "scripts/examples/gn_build_example.sh examples/tv-app/linux/ out/tv-app"
 
                   # Try using the gn build command instead:
-                  gn gen --check --fail-on-unused-args --root=examples/tv-app/linux out/tv-app '--args=chip_crypto="boringssl" is_asan=true is_clang=true' \
+                  gn gen --check --fail-on-unused-args --root=examples/tv-app/linux out/tv-app '--args=chip_crypto="boringssl" is_asan=true is_clang=true'
                   ninja -C out/tv-app
 
             - name: Build Linux tv-casting-app
@@ -69,7 +69,7 @@ jobs:
                   #   "scripts/examples/gn_build_example.sh examples/tv-casting-app/linux/ out/tv-casting-app chip_casting_simplified=true"
 
                   # Try using the gn build command instead:
-                  gn gen --check --fail-on-unused-args --root=examples/tv-casting-app/linux out/tv-casting-app '--args=chip_casting_simplified=true chip_crypto="boringssl" is_asan=true is_clang=true' \
+                  gn gen --check --fail-on-unused-args --root=examples/tv-casting-app/linux out/tv-casting-app '--args=chip_casting_simplified=true chip_crypto="boringssl" is_asan=true is_clang=true'
                   ninja -C out/tv-casting-app
 
             - name: