[widgets] test-cases for icons: some possible errors

Some more potential test case errors and fixes:

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bl.wgt

✔ Tests the UA's ability to locate an icon in a locale folder and at  
the root of the widget. To pass, after processing, the icons list must  
contain a pointer to "locales/en/icon.jpg", and "icon.png", which is  
at the root of the widget. The icons list needs to be in the correct  
order, where "locales/en/icon.jpg" must be first and "icon.png" must  
be second.

Following Step 9 and using "Rule for Finding a File Within a Widget  
Package" I always get these the other way around, as "icon.png" is in  
front of "icon.jpg" in the default icons list

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bm.wgt

✔ Tests the UA's ability to deal with custom icon declaration in the  
config document and matching default icons. To pass, the icons list  
must contain a pointer to "locales/en/icon.jpg" and "icon.png", which  
is at the root of the widget. The list needs to be in the correct  
order, where "locales/en/icon.jpg" must be first and "icon.png" must  
be second.

Following Step 9 and using "Rule for Finding a File Within a Widget  
Package" I always get these the other way around, as "icon.png" is in  
front of "icon.jpg" in the default icons list

======

bn.wgt

"✔ Tests the UA's ability to deal with custom icon declarations in  
the config document and matching default icons. To pass, the icons  
list must contain a pointer to "icons/pass.png", and "icon.png", which  
is at the root of the widget. The list needs to be in the correct  
order, where "icons/pass.png" must be first, followed by "icon.png".

As "{root}/icon.png" doesn't exist I think this should instead be

✔ Tests the UA's ability to deal with custom icon declarations in the  
config document and matching default icons. To pass, the icons list  
must contain a pointer to "icons/pass.png", and "locales/en/icon.png",  
which is at the root of the widget. The list needs to be in the  
correct order, where "icons/pass.png" must be first, followed by  
"locales/en/icon.png".

======

bp.wgt

✔ Test the UA's ability to load default icons in the correct order.  
To pass, the icons list must contain a pointer "icon.png" followed by  
a pointer to "en/locales/icon.jpg".

Looks like a typo; I think this should instead be:

✔ Test the UA's ability to load default icons in the correct order.  
To pass, the icons list must contain a pointer "icon.png" followed by  
a pointer to "locales/en/icon.jpg".

======

zz.wgt

✔ Tests the ability of the user agent to correctly deal with an icon  
element that points to a file that is not present in the widget  
package. To pass, the icon list must contain "pass.png".

I don't think this is correct - either the package needs to include  
the file "icon.png" and that gets in the list, or the list needs to be  
empty, as there is no rule that identifies "pass.png" is a valid icon  
when its not specified as a custom icon.