browser: drop download save screen handling

Firefox 97 is now stable on all releases, so we can forget about
handling browser_download_save and just assume download will
happen automatically.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/firefox/download_save-20200117.json

@@ -1,16 +0,0 @@
-{
-  "area": [
-    {
-      "height": 14,
-      "type": "match",
-      "ypos": 318,
-      "width": 59,
-      "xpos": 95
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "browser_download_save",
-    "firefox_download_save"
-  ]
-}

needles/firefox/download_save-kde-20191129.json

@@ -1,16 +0,0 @@
-{
-  "area": [
-    {
-      "type": "match",
-      "ypos": 398,
-      "width": 60,
-      "xpos": 332,
-      "height": 13
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "browser_download_save",
-    "firefox_download_save"
-  ]
-}

needles/firefox/download_save-kde-noto-20210407.json

@@ -1,16 +0,0 @@
-{
-  "area": [
-    {
-      "type": "match",
-      "width": 55,
-      "xpos": 332,
-      "height": 13,
-      "ypos": 415
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "browser_download_save",
-    "firefox_download_save"
-  ]
-}

tests/desktop_browser.pm

@@ -49,16 +49,6 @@ sub run {
     type_very_safely "https://kernel.org\n";
     assert_and_click "browser_kernelorg_patch";
     wait_still_screen(stilltime=>2, similarity_level=>45);
-    # FIXME: Firefox 97+ don't show the "choose what to do" popup
-    # by default, they just download the file. Once 97 is stable
-    # on all releases we can drop the browser_download_save handling
-    assert_screen ["browser_download_save", "browser_download_complete"];
-    if (match_has_tag("browser_download_save")) {
-        click_lastmatch;
-        sleep 2;
-        send_key 'ret';
-        wait_still_screen(stilltime=>3, similarity_level=>45);
-    }
     # browsers do...something...when the download completes, and we
     # expect there's a single click to make it go away and return
     # browser to a state where we can open a new tab