patch 9.0.1353: too many "else if" statements to handle option values

Problem:    Too many "else if" statements to handle option values.
Solution:   Add more functions to handle option value changes. (Yegappan
            Lakshmanan, closes #12058)
diff --git a/src/option.h b/src/option.h
index 9cc540a..487d87c 100644
--- a/src/option.h
+++ b/src/option.h
@@ -299,7 +299,8 @@
 #define GO_FOOTER	'F'		// add footer
 #define GO_VERTICAL	'v'		// arrange dialog buttons vertically
 #define GO_KEEPWINSIZE	'k'		// keep GUI window size
-#define GO_ALL		"!aAbcdefFghilmMprtTvk" // all possible flags for 'go'
+// all possible flags for 'go'
+#define GO_ALL		"!aAbcdefFghilLmMpPrRtTvk"
 
 // flags for 'comments' option
 #define COM_NEST	'n'		// comments strings nest