refactor(vterm): update vterm DA1 response

Update vterm's DA1 response to the more modern version that indicates
level 1 support for VT100 emulation (61) as well as ANSI color support
(22).

src/nvim/vterm/state.c

@@ -20,7 +20,7 @@
 // Primary Device Attributes (DA1) response.
 // We make this a global (extern) variable so that we can override it with FFI
 // in tests.
-char vterm_primary_device_attr[] = "1;2;52";
+char vterm_primary_device_attr[] = "61;22;52";
 
 // Some convenient wrappers to make callback functions easier
 

test/functional/terminal/tui_spec.lua

@@ -3539,7 +3539,7 @@ describe('TUI', function()
         extern char vterm_primary_device_attr[]
       ]]
 
-      ffi.copy(ffi.C.vterm_primary_device_attr, '1;2')
+      ffi.copy(ffi.C.vterm_primary_device_attr, '61;22')
     end)
 
     exec_lua([[

test/unit/vterm_spec.lua

@@ -2659,7 +2659,7 @@ putglyph 1f3f4,200d,2620,fe0f 2 0,4]])
     -- DA
     reset(state, nil)
     push('\x1b[c', vt)
-    expect_output('\x1b[?1;2;52c')
+    expect_output('\x1b[?61;22;52c')
 
     -- XTVERSION
     reset(state, nil)