src/main.cpp: Initialize LC_NUMERIC with 'POSIX'.

 This assures that float number conversions (from float to string via
 e.g. g_strdup_sprintf()) always use a dot in decimal numbers.

 This resolves blackening of the screen if users with e.g. de_DE.UTF-8
 use the brightness slider and hand over a komma-decimal to the xsct
 executable (which only understands dot-decimals).

 As we don't use numbers / number conversions anywhere else in the
 display indicator, this global setting of LC_NUMERIC seems to be the
 easiest approach.

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