Revert "feat(ui): negative prompt boxes are italicized"

This reverts commit 49c4704.

Author: psychedelicious

invokeai/frontend/web/src/features/controlLayers/components/RGLayer/RGLayerNegativePrompt.tsx

@@ -45,7 +45,6 @@ export const RGLayerNegativePrompt = memo(({ layerId }: Props) => {
           variant="darkFilled"
           paddingRight={30}
           fontSize="sm"
-          fontStyle="oblique 10deg"
           spellCheck={false}
         />
         <PromptOverlayButtonWrapper>

invokeai/frontend/web/src/features/parameters/components/Core/ParamNegativePrompt.tsx

@@ -39,7 +39,6 @@ export const ParamNegativePrompt = memo(() => {
           fontSize="sm"
           variant="darkFilled"
           paddingRight={30}
-          fontStyle="oblique 10deg"
           spellCheck={false}
         />
         <PromptOverlayButtonWrapper>

invokeai/frontend/web/src/features/sdxl/components/SDXLPrompts/ParamSDXLNegativeStylePrompt.tsx

@@ -42,7 +42,6 @@ export const ParamSDXLNegativeStylePrompt = memo(() => {
           fontSize="sm"
           variant="darkFilled"
           paddingRight={30}
-          fontStyle="oblique 10deg"
           spellCheck={false}
         />
         <PromptOverlayButtonWrapper>