Remove unused tokens from common/tokenize.gperf

This list was generated with the following shell script snippet:

for x in $(tr "[a-z]" "[A-Z]" < common/tokenize.gperf)
do
  y="A_TK_$x"
  if git grep " $y[:)]" > /dev/null
  then
    : echo found: $y
  else
    echo not found: $y
  fi
done

Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Julien Danjou <julien@danjou.info>

common/tokenize.gperf

@@ -19,7 +19,6 @@ center
 char
 class
 client
-color
 Control
 conffile
 content
@@ -41,7 +40,6 @@ group_id
 grow
 height
 hide
-honorsizehints
 icon
 icon_name
 id
@@ -59,7 +57,6 @@ margin
 maximized_horizontal
 maximized_vertical
 middle
-minimize
 minimized
 Mod1
 Mod2