supported-products: Remove unnecessary characters near buttons

[prophanetes]

https://ubports.com/supported-products

• Vollafone section, stray "=" between 'more information' and 'order here' buttons.
• Fairphone 2 section, stray "= j" after the 'more information' button.
• Nexus 5 section, stray "= j" after the 'more information' button.
• OnePlus One section, stray "= j" after the 'more information" button.
• PinePhone section, stray "=" between the 'more information' and 'flash your phone' buttons.
• PineTab section, stray "=" between the 'more information' and 'flash your tablet' buttons.