Updating GREP_COLORS due to deprecation

dot_config/zsh/configs/colors.zsh

@@ -1,7 +1,7 @@
 export CLICOLOR=1       # enable colored output from ls, etc. on FreeBSD-based systems
 
 if [ -x /usr/bin/dircolors ]; then
-    export GREP_COLOR='1;32'
+    export GREP_COLOR='mt=1;32'
     LS_COLORS_AUDIO="38;5;218"
     LS_COLORS_VIDEO="38;5;216"
     LS_COLORS_ARCHIVE="38;5;204"