refactor: update Dockerfile.ubuntu-2204

- Replaced `nvim` with `vim` in the list of installed packages.
- Updated the curl command to download `linuxgsm.sh` by using the `-Lo` option instead of just `-o`.
- No longer fetching LinuxGSM modules separately.

This commit refactors the Dockerfile for Ubuntu 20.04, making these changes to improve package installation and file downloading processes.

Dockerfile.ubuntu-2204

@@ -61,7 +61,7 @@ RUN echo "**** Install Base LinuxGSM Requirements ****" \
   iproute2 \
   iputils-ping \
   nano \
-  nvim \
+  vim \
   && apt-get -y autoremove \
   && apt-get -y clean \
   && rm -rf /var/lib/apt/lists/* \
@@ -102,7 +102,7 @@ HEALTHCHECK --interval=1m --timeout=1m --start-period=2m --retries=1 CMD /app/en
 ## Download linuxgsm.sh
 RUN echo "**** Download linuxgsm.sh ****" \
   && set -ex \
-  && curl -o linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
+  && curl -Lo linuxgsm.sh "https://raw.githubusercontent.com/GameServerManagers/LinuxGSM/${LGSM_GITHUBBRANCH}/linuxgsm.sh" \
   && chmod +x linuxgsm.sh
 
 RUN echo "**** Get LinuxGSM Modules ****" \