Revert "install.sh: adapt behviour when calling with argument"

This reverts commit 8a253e1090.

install.sh

@@ -4,32 +4,26 @@ run_directory=$(dirname "$0")
 
 if [ -z "$1" ]; then
   user=$(whoami)
-  if [[ $user != 'root' ]]; then
-    echo "Copying rcs to home directory..."
-    cp $run_directory/bashrc /home/$user/.bashrc
-    cp $run_directory/vimrc /home/$user/.vimrc
-    cp $run_directory/tmux.conf /home/$user/.tmux.conf
-    if ! command -v sudo &> /dev/null; then
-      echo "Could not copy to root directory: sudo was not found."
-    else
-      echo "Copying rcs to root directory..."
-      sudo cp $run_directory/bashrc /root/.bashrc
-      sudo cp $run_directory/vimrc /root/.vimrc
-      sudo cp $run_directory/tmux.conf /root/.tmux.conf
-    fi
+else
+  user=$1
+fi
+
+if [[ $user != 'root' ]]; then
+  echo "Copying rcs to home directory..."
+  cp $run_directory/bashrc /home/$user/.bashrc
+  cp $run_directory/vimrc /home/$user/.vimrc
+  cp $run_directory/tmux.conf /home/$user/.tmux.conf
+
+  if ! command -v sudo &> /dev/null; then
+    echo "Could not copy to root directory: sudo was not found."
   else
     echo "Copying rcs to root directory..."
-    cp $run_directory/bashrc /root/.bashrc
-    cp $run_directory/vimrc /root/.vimrc
-    cp $run_directory/tmux.conf /root/.tmux.conf
+    sudo cp $run_directory/bashrc /root/.bashrc
+    sudo cp $run_directory/vimrc /root/.vimrc
+    sudo cp $run_directory/tmux.conf /root/.tmux.conf
   fi
 
-else # running from a setup script, assuming as root
-  user=$1
-  echo "Copying rcs to home directory..."
-  sudo -H -u $user cp $run_directory/bashrc /home/$user/.bashrc
-  sudo -H -u $user cp $run_directory/vimrc /home/$user/.vimrc
-  sudo -H -u $user cp $run_directory/tmux.conf /home/$user/.tmux.conf
+else
   echo "Copying rcs to root directory..."
   cp $run_directory/bashrc /root/.bashrc
   cp $run_directory/vimrc /root/.vimrc