Adjust tests to match WGSL spec on number literals

Suffixes are not type names and currently only a plain `u` is supported
for uints. More specifically, `i` and `f` suffixes or suffixes with
widths in bits like `u32` are not supported at the moment.

src/front/wgsl/lexer.rs

@@ -677,7 +677,12 @@ fn test_tokens() {
             Token::Number {
                 value: "2",
                 ty: 'u',
-                width: "3",
+                width: "",
+            },
+            Token::Number {
+                value: "3",
+                ty: 'i',
+                width: "",
             },
             Token::Word("o"),
         ],
@@ -688,9 +693,9 @@ fn test_tokens() {
             Token::Number {
                 value: "2.4",
                 ty: 'f',
-                width: "44",
+                width: "",
             },
-            Token::Word("po"),
+            Token::Word("f44po"),
         ],
     );
     sub_test(

src/front/wgsl/tests.rs

@@ -88,7 +88,7 @@ fn parse_type_inference() {
         fn foo() {
             let a = 2u;
             let b: u32 = a;
-            var x = 3f32;
+            var x = 3.;
             var y = vec2<f32>(1, 2);
         }",
     )