scripts: Consistently use color='auto' default in main

scripts/codemap.py

@@ -902,7 +902,7 @@ def main_(f, paths, *,
         labels=[],
         chars=[],
         colors=[],
-        color=False,
+        color='auto',
         dots=False,
         braille=False,
         width=None,

scripts/dbgbmap.py

@@ -4337,7 +4337,7 @@ def main_(f, disk, mroots=None, *,
         mtree_only=False,
         chars=[],
         colors=[],
-        color=False,
+        color='auto',
         dots=False,
         braille=False,
         width=None,

scripts/plot.py

@@ -1161,7 +1161,7 @@ def main_(f, csv_paths, *,
         chars=[],
         line_chars=[],
         colors=[],
-        color=False,
+        color='auto',
         dots=False,
         braille=False,
         points=False,

scripts/tracebd.py

@@ -1399,7 +1399,6 @@ def main(path='-', *,
         wear_chars=[],
         colors=[],
         wear_colors=[],
-        # TODO this should be color='auto' in all scripts
         color='auto',
         dots=False,
         braille=False,

scripts/treemap.py

@@ -915,7 +915,7 @@ def main_(f, csv_paths, *,
         labels=[],
         chars=[],
         colors=[],
-        color=False,
+        color='auto',
         dots=False,
         braille=False,
         width=None,