Improves travis buildroot regexp

buildroot/bin/opt_disable

 #!/usr/bin/env bash
 
 for opt in "$@" ; do
-  eval "sed -i 's/\(\/\/ *\)*\(\#define +$opt[^a-zA-Z0-9_]\)/\/\/\2/g' Marlin/Configuration.h"
+  eval "sed -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration.h"
 done

buildroot/bin/opt_disable_adv

+#!/usr/bin/env bash
+
+for opt in "$@" ; do
+  eval "sed -i 's/\([[:blank:]]*\)\(#define \b${opt}\b\)/\1\/\/\2/g' Marlin/Configuration_adv.h"
+done

buildroot/bin/opt_enable

 #!/usr/bin/env bash
 
 for opt in "$@" ; do
-  eval "sed -i 's/\/\/ *\(#define +$opt[^a-zA-Z0-9_]\)/\1/g' Marlin/Configuration.h"
+  eval "sed -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration.h"
 done

buildroot/bin/opt_enable_adv

 #!/usr/bin/env bash
 
 for opt in "$@" ; do
-  eval "sed -i 's/\/\/ *\(#define +$opt[^a-zA-Z0-9_]\)/\1/g' Marlin/Configuration_adv.h"
+  eval "sed -i 's/\/\/[[:blank:]]*\(#define \b${opt}\b\)/\1/g' Marlin/Configuration_adv.h"
 done

buildroot/bin/opt_set

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define +$1 +\)[^ ]*$/\1 $2/g' Marlin/Configuration.h"
+eval "sed -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration.h"

buildroot/bin/opt_set_adv

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define +$1 +\)[^ ]*$/\1 $2/g' Marlin/Configuration_adv.h"
+eval "sed -i 's/\(#define \b${1}\b\).*$/\1 ${2}/g' Marlin/Configuration_adv.h"

buildroot/bin/pins_set

 #!/usr/bin/env bash
 
-eval "sed -i 's/\(#define +$2 +\)[^ ]*$/\1 $3/g' Marlin/pins_$1.h"
+eval "sed -i 's/\(#define \b${2}\b\).*$/\1 ${3}/g' Marlin/pins_${1}.h"