MAGETWO-85683: Apostrophe displays as code in the text field box

 - Widget fix
 - Widget unit test fix

Author: SeruyV

app/code/Magento/Widget/Model/Widget.php

@@ -315,7 +315,7 @@ public function getWidgetDeclaration($type, $params = [], $asIs = true)
                 }
             }
             if (isset($value)) {
-                $directive .= sprintf(' %s="%s"', $name, $this->escaper->escapeQuote($value));
+                $directive .= sprintf(' %s="%s"', $name, $this->escaper->escapeHtmlAttr($value, false));
             }
         }
 

app/code/Magento/Widget/Test/Unit/Model/WidgetTest.php

@@ -175,7 +175,7 @@ public function testGetWidgetDeclaration()
         $this->conditionsHelper->expects($this->once())->method('encode')->with($conditions)
             ->willReturn('encoded-conditions-string');
         $this->escaperMock->expects($this->atLeastOnce())
-            ->method('escapeQuote')
+            ->method('escapeHtmlAttr')
             ->willReturnMap([
                 ['my "widget"', false, 'my "widget"'],
                 ['1', false, '1'],