Cleanup: remove tabs after line start

Allows expanding tabs before running clang-format.

source/blender/python/intern/bpy_props.c

@@ -1905,7 +1905,7 @@ static void bpy_prop_callback_assign_enum(struct PropertyRNA *prop, PyObject *ge
 
 #define BPY_PROPDEF_UNIT_DOC \
 "   :arg unit: Enumerator in ['NONE', 'LENGTH', 'AREA', 'VOLUME', 'ROTATION', 'TIME', 'VELOCITY', 'ACCELERATION', 'MASS', 'CAMERA'].\n" \
-"   :type unit: string\n"	\
+"   :type unit: string\n" \
 
 #define BPY_PROPDEF_NUM_MIN_DOC \
 "   :arg min: Hard minimum, trying to assign a value below will silently assign this minimum instead.\n" \