text position: use size instead of bounds (#13858)

# Objective

- #13846 introduced a bug where text not bound was not displayed

## Solution

- bounds are infinite
- use computed size instead, that already should be using the available
bounds

crates/bevy_text/src/pipeline.rs

@@ -87,10 +87,16 @@ impl TextPipeline {
 
         let size = compute_text_bounds(&section_glyphs, |index| scaled_fonts[index]).size();
 
+        let h_limit = if bounds.x.is_finite() {
+            bounds.x
+        } else {
+            size.x
+        };
+
         let h_anchor = match text_alignment {
             JustifyText::Left => 0.0,
-            JustifyText::Center => bounds.x * 0.5,
-            JustifyText::Right => bounds.x * 1.0,
+            JustifyText::Center => h_limit * 0.5,
+            JustifyText::Right => h_limit * 1.0,
         }
         .floor();