miniterm: fix escapes, F'keys on win32
diff --git a/serial/tools/miniterm.py b/serial/tools/miniterm.py
index 2cceff6..1ed04b7 100644
--- a/serial/tools/miniterm.py
+++ b/serial/tools/miniterm.py
@@ -104,16 +104,16 @@
 
     class Console(ConsoleBase):
         fncodes = {
-            ';': '\1bOP',  # F1
-            '<': '\1bOQ',  # F2
-            '=': '\1bOR',  # F3
-            '>': '\1bOS',  # F4
-            '?': '\1b[15~',  # F5
-            '@': '\1b[17~',  # F6
-            'A': '\1b[18~',  # F7
-            'B': '\1b[19~',  # F8
-            'C': '\1b[20~',  # F9
-            'D': '\1b[21~',  # F10
+            ';': '\x1bOP',  # F1
+            '<': '\x1bOQ',  # F2
+            '=': '\x1bOR',  # F3
+            '>': '\x1bOS',  # F4
+            '?': '\x1b[15~',  # F5
+            '@': '\x1b[17~',  # F6
+            'A': '\x1b[18~',  # F7
+            'B': '\x1b[19~',  # F8
+            'C': '\x1b[20~',  # F9
+            'D': '\x1b[21~',  # F10
         }
         navcodes = {
             'H': '\x1b[A',  # UP