Fixed bug when button text is too long to fit in button.
Fixed bug when button text is too long to fit in button.

Steps to reproduce the issue:
- Pack an extension successfully
- A PEM file is created
- Pack same extension
- Button should say "Pack anyway" where "anyway" is not readable.
modulexcite/apps-developer-tools,modulexcite/apps-developer-tools,GoogleChrome/apps-developer-tools,modulexcite/apps-developer-tools,adrifelt/apps-developer-tools,adrifelt/apps-developer-tools,GoogleChrome/apps-developer-tools