top: do not print ${top mem 1} as inf if $mem not used

[bi4k8]

Checklist

• I have described the changes
• I have linked to any relevant GitHub issues, if applicable
• [n/a] Documentation in doc/ has been updated
• All new code is licensed under GPLv3

Description

This adds a call to update_meminfo() before attempting to update top processes, because they depend on the meminfo being sane. This fixes issue #960.

Tested with the below conkyrc:

conky.config = { 
    out_to_console = true,
    out_to_x = false,
    update_interval = 1,
} 
 
conky.text = [[
${color grey}Name              PID   CPU%   MEM%
${color lightgrey} ${top name 1} ${top pid 1} ${top cpu 1} ${top mem 1}
]]

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