fixes button movement from home/web to tabswitcher (#3955)

Task/Issue URL: https://app.asana.com/0/0/1209358244103060/f
Tech Design URL:
CC:

**Description**:
Fix fire button movement by adding some padding to the fire button
image.

**Steps to test this PR**:
1. Open the tab switcher and make sure the fire button doesn't appear to
move.
2. Check on a couple of different phone types. Can ignore SE as that has
had a up/down movement problem for some time.

**Definition of Done (Internal Only)**:

* [x] Does this PR satisfy our [Definition of
Done](https://app.asana.com/0/1202500774821704/1207634633537039/f)?

DuckDuckGo/Assets.xcassets/FireLeftPadded.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "fire_2.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "template-rendering-intent" : "template"
+  }
+}

DuckDuckGo/TabSwitcherViewController+MultiSelect.swift

@@ -489,7 +489,7 @@ extension TabSwitcherViewController {
             self.addNewTab()
         })
 
-        barsHandler.fireButton.primaryAction = action(image: "Fire") { [weak self] in
+        barsHandler.fireButton.primaryAction = action(image: "FireLeftPadded") { [weak self] in
             guard let self else { return }
             self.burn(sender: self.barsHandler.fireButton)
         }