option "open image button" open the actual dir

[w-e-w]

Description

one of the things that annoys me no end is that the open image button don't actually opens the actual output dir but the output root

this is annoying for people that uses subdirectories, this is one extra click for every time they use open image button
also since we would navigate in the the suvdir the next time we click the button it opens a new windwos causing lots of extra windows to be open

this PR makes it so it will to open the actual directory and not output root

I decided to enable this option by default because I feel like it's more natural option

this also would be useful if one has images up to different directories (such as the grid images)

user can select which directory to open

• Output root will always open the main output root (effectively disabling this PR)
• Subdirectory will open the the actual directory
• Subdirectory (even temp dir) same as Subdirectory but will also open the temp dir (when image is not always saved)

if possible I like to squeeze this into 1.8 RC

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[AUTOMATIC1111]

We will fit it into 1.8 but are settings necessary? Seems like a good change that doesn't need any configuration.

[w-e-w]

Seems like a good change that doesn't need any configuration.

that's why I enabled it by default
but I think in some cases someone might prefer the old behavior
since adding a setting allows people to go use the old behavior at nearly no cost, so it's more of a why not provide an option

I don't really like the wording of my settings descriptions if you have suggestions