Fix positioning on base error dialog
Fix positioning on base error dialog

Base's error dialog was not correctly sized or laid out, causing
large error messages to scroll offscreen and not be scrollable. This
sets everything up more-correctly.
catapult-project/catapult,danbeam/catapult,catapult-project/catapult-csm,vmpstr/trace-viewer,catapult-project/catapult,vmpstr/trace-viewer,sahiljain/catapult,scottmcmaster/catapult,sahiljain/catapult,scottmcmaster/catapult,catapult-project/catapult,modulexcite/catapult,danbeam/catapult,catapult-project/catapult-csm,sahiljain/catapult,vmpstr/trace-viewer,benschmaus/catapult,dstockwell/catapult,modulexcite/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,benschmaus/catapult,zeptonaut/catapult,modulexcite/catapult,benschmaus/catapult,catapult-project/catapult,0x90sled/catapult,SummerLW/Perf-Insight-Report,danbeam/catapult,sahiljain/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,dstockwell/catapult,scottmcmaster/catapult,catapult-project/catapult-csm,catapult-project/catapult,SummerLW/Perf-Insight-Report,SummerLW/Perf-Insight-Report,benschmaus/catapult,0x90sled/catapult,dstockwell/catapult,sahiljain/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult-csm,0x90sled/catapult,catapult-project/catapult-csm,dstockwell/catapult,catapult-project/catapult,sahiljain/catapult,zeptonaut/catapult,zeptonaut/catapult,danbeam/catapult,catapult-project/catapult,benschmaus/catapult