[mirotalksfu] - fix typo

.env.template

@@ -299,7 +299,7 @@ SHOW_EMOJI=true                                   # Show emoji button (true|fals
 SHOW_SETTINGS=true                                # Show settings button (true|false)
 SHOW_ABOUT=true                                   # Show about button (true|false)
 SHOW_EXIT_BUTTON=true                             # Show exit button (true|false)
-SHOW_EXTRA_BUTTONS=true                           # Show extra buttons (true|false)
+SHOW_EXTRA_BUTTON=true                            # Show extra buttons (true|false)
 
 # Settings Panel
 ENABLE_FILE_SHARING=true                          # Enable file sharing (true|false)