Remove the git.paging.useConfig option

Many people don't understand what this means, which is apparent from the amount
of issues that got filed because of this. Let's get rid of it to avoid this
confusion. People will have to configure their pager twice if they want to use
it both on the command line and in lazygit, which I think is not a big deal.

pkg/commands/git_commands/config.go

@@ -43,12 +43,6 @@ func (self *ConfigCommands) ConfiguredPager() string {
 }
 
 func (self *ConfigCommands) GetPager(width int) string {
-	useConfig := self.UserConfig().Git.Paging.UseConfig
-	if useConfig {
-		pager := self.ConfiguredPager()
-		return strings.Split(pager, "| less")[0]
-	}
-
 	templateValues := map[string]string{
 		"columnWidth": strconv.Itoa(width/2 - 6),
 	}