fix(ui5-button): stabilizing buttons line-height (#3416)

Fixes: #3401
Closes: #3401

Author: tsanislavgatev

packages/main/src/themes/Button.css

@@ -7,6 +7,7 @@
 :host {
 	min-width: var(--_ui5_button_base_min_width);
 	height: var(--_ui5_button_base_height);
+	line-height: normal;
 	font-family: "72override", var(--sapFontFamily);
 	font-size: var(--sapFontSize);
 	text-shadow: var(--_ui5_button_text_shadow);