Fix incorrect package size calculation

The du command prints the size and then the full path and if the full path
contains numbers, the tr command adds them to the size.
Therefore it is better to use awk.

install/deb-build.sh

@@ -227,7 +227,7 @@ Depends: $PACKAGE_DEPENDS
 Architecture: $PACKAGE_ARCH
 Maintainer: Nick Egorrov <nicegorov@yandex.ru>
 Description: $PACKAGE_DEBIAN_DESCRIPTION
-Installed-Size: $(du -s "$PACKAGE_DIR" | tr -cd 0-9)
+Installed-Size: $(du -s "$PACKAGE_DIR" | awk '{print $1}')
 EOF
 
 if [ -f "${PACKAGE_FULL_NAME}.deb" ]; then