fix bad default for legend spacing variables. closes #2943.

[clauswilke]

This is a minimal fix for #2943. It guarantees that plot legends look fine when legend.title = element_blank(), but otherwise doesn't change the appearance of the legend. In the future, this should be refactored, because the same variables control the overall spacing between the legend title and the legend keys and the spacing between individual legend items. There should be two separate variables for that.

library(ggplot2)

df <- reshape2::melt(outer(1:4, 1:4), varnames = c("X1", "X2"))
p1 <- ggplot(df, aes(X1, X2)) + geom_tile(aes(fill = value))

p1 + scale_fill_continuous(guide = guide_legend())

p1 + scale_fill_continuous(guide = guide_legend()) +
  theme(legend.title=element_blank())

p1

p1 + theme(legend.title=element_blank())

^{Created on 2019-04-26 by the reprex package (v0.2.1)}

[thomasp85]

LGTM

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