fix(input): update error text color for ionic theme

[thetaPC]

Issue number: internal

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What is the current behavior?

The error text has already been implemented. However, the color does not match the design for the ionic theme.

What is the new behavior?

• The error text color has been updated to match the design for the ionic theme.
• The bottom content input test has been adjusted to include ionic-md.
• The color was hard coded until the ionic design tokens are set.

Does this introduce a breaking change?

• Yes
• No

Other information

The input snapshots look plain because this PR only focuses on the error text.