don't allow columns to be lower than 1, previously this would hide items

but we have hideitems now making this useless

libs/arg.c

@@ -498,7 +498,7 @@ void
 setcolumns(const Arg *arg)
 {
     columns += arg->i;
-    if (columns < 0) columns = 0;
+    if (columns < 1) columns = 1;
 
     match();
     resizeclient();

libs/argv.c

@@ -386,6 +386,9 @@ readargs(int argc, char *argv[])
 	    fstrstr = cistrstr;
     }
 
+    if (!columns)
+        columns = 1;
+
     // initial text
     if (input)
         insert(input, strlen(input));