Fix issue processwire/processwire-issues#1465 for "InputfieldImage proportional thumbnails not displayed properly in some situations" by adding suggested fix by @Toutouwai

wire/modules/Inputfield/InputfieldImage/InputfieldImage.js

@@ -2354,6 +2354,10 @@ function InputfieldImage($) {
 		}).on('opened', '.InputfieldImage', function() {
 			//console.log('InputfieldImage opened');
 			initInputfield($(this));
+		}).on('opened', function() {
+			$(this).find(".InputfieldImage").each(function() {
+				initInputfield($(this));
+			});
 		});
 	}