Fix linkify helper index out of bounds with parenthesis (#6140)

When parenthesis were mismatched by having more opening parenthesis than closing ones, we could end up incorrectly making the URLSpan `end` value greater than the actual text length, causing an `IndexOutOfBoundsException`

libraries/androidutils/src/main/kotlin/io/element/android/libraries/androidutils/text/LinkifyHelper.kt

@@ -97,7 +97,7 @@ object LinkifyHelper {
             val closingParenthesisCount = linkifiedTextLastPath.count { it == ')' }
             val openingParenthesisCount = linkifiedTextLastPath.count { it == '(' }
             // If it's not part of a pair, remove it from the link span by adjusting the end index
-            end -= closingParenthesisCount - openingParenthesisCount
+            end -= (closingParenthesisCount - openingParenthesisCount).coerceAtLeast(0)
         }
         return end
     }