Remove duplicate libappindicator3

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
           override: true
       - uses: Swatinem/rust-cache@v1
       - run: sudo apt-get update
-      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev libappindicator3-dev
+      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev
       - uses: actions-rs/cargo@v1
         with:
           command: check
@@ -32,7 +32,7 @@ jobs:
           override: true
       - uses: Swatinem/rust-cache@v1
       - run: sudo apt-get update
-      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev libappindicator3-dev
+      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev
       - uses: actions-rs/cargo@v1
         with:
           command: test
@@ -67,7 +67,7 @@ jobs:
           override: true
       - uses: Swatinem/rust-cache@v1
       - run: sudo apt-get update
-      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev libappindicator3-dev
+      - run: sudo apt install libwebkit2gtk-4.0-dev libappindicator3-dev libgtk-3-dev
       - run: rustup component add clippy
       - uses: actions-rs/cargo@v1
         with: