Logo (Builtin): fix OpenBSD & OpenBSD_small

Fix #1522

Author: CarterLi

src/logo/ascii/openbsd.txt

@@ -7,17 +7,17 @@ $1     / ||\| Y J  )   / |/| ./
     J  |)'( |        ` F`.'/       $3 _
 $1  -<|  F         __     .-<        $3(_)
 $1    | /       .-'$3. $1`.  /$3-. $1L___
-    J \\      <    $3\ $1 | | $5O$3\\$1|.-' $3 _
-$1  _J \\  .-    \\$3/ $5O $3| $1| \\  |$1F    $3(_)
-$1 '-F  -<_.     \\   .-'  `-' L__
+    J \      <    $3\ $1 | | $5O$3\$1|.-' $3 _
+$1  _J \  .-    \$3/ $5O $3| $1| \  |$1F    $3(_)
+$1 '-F  -<_.     \   .-'  `-' L__
 __J  _   _.     >-'  $1)$4._.   $1|-'
 $1 `-|.'   /_.          $4\_|  $1 F
   /.-   .                _.<
- /'    /.'             .'  `\\
-  /L  /'   |/      _.-'-\\
+ /'    /.'             .'  `\
+  /L  /'   |/      _.-'-\
  /'J       ___.---'\|
    |\  .--' V  | `. `
    |/`. `-.     `._)
-      / .-.\\
-      \\ (  `\\
-       `.\\
+      / .-.\
+      \ (  `\
+       `.\

src/logo/ascii/openbsd_small.txt

@@ -1,7 +1,7 @@
-$1      _____
-    \\-     -/
- \\_/         \\
+      _____
+    \-     -/
+ \_/         \
  |        $2O O$1 |
  |_  <   )  3 )
- / \\         /
-    /-_____-\\
+ / \         /
+    /-_____-\