Fix form control label tooltip bug (#635)

Author: clintcs

.changeset/eleven-cobras-lie.md

@@ -0,0 +1,5 @@
+---
+'@crowdstrike/glide-core': patch
+---
+
+Form control label tooltips, shown when labels are truncated, are no longer empty.

src/label.ts

@@ -121,7 +121,7 @@ export default class GlideCoreLabel extends LitElement {
 
         <glide-core-tooltip
           class="label-tooltip"
-          label=${ifDefined(this.tooltip)}
+          label=${ifDefined(this.label)}
           placement="right"
           ?disabled=${!this.isLabelTooltip}
           screenreader-hidden