[Glitch] Fix width of large text icon buttons

Port 38753acaa5 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/compose/components/text_icon_button.jsx

@@ -4,7 +4,7 @@ import { PureComponent } from 'react';
 const iconStyle = {
   height: null,
   lineHeight: '27px',
-  width: `${18 * 1.28571429}px`,
+  minWidth: `${18 * 1.28571429}px`,
 };
 
 export default class TextIconButton extends PureComponent {